Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free. This vulnerability affects Firefox < 134, Firefox ESR < 128.6, Thunderbird < 134, and Thunderbird ESR < 128.6.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:0056-1 advisory.

    - Firefox Extended Support Release 128.6.0 ESR
      * Fixed: Various security fixes.

      MFSA 2025-02 (bsc#1234991)
      * CVE-2025-0237 (bmo#1915257)         WebChannel APIs susceptible to confused deputy attack
      * CVE-2025-0238 (bmo#1915535)         Use-after-free when breaking lines
      * CVE-2025-0239 (bmo#1929156)         Alt-Svc ALPN validation failure when redirected
      * CVE-2025-0240 (bmo#1929623)         Compartment mismatch when parsing JavaScript JSON module
      * CVE-2025-0241 (bmo#1933023)         Memory corruption when using JavaScript Text Segmentation
      * CVE-2025-0242 (bmo#1874523, bmo#1926454, bmo#1931873,         bmo#1932169)         Memory safety bugs fixed in Firefox 134, Thunderbird 134,         Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19,         and Thunderbird 128.6
      * CVE-2025-0243 (bmo#1827142, bmo#1932783)         Memory safety bugs fixed in Firefox 134, Thunderbird 134,         Firefox ESR 128.6, and Thunderbird 128.6

    - Firefox Extended Support Release 128.5.2 ESR
      * Fixed: Fixed a crash experienced by Windows users with Qihoo         360 Total Security Antivirus software installed (bmo#1934258)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:0136 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:0162 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:0135 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:0137 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:0133 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 134.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-04 advisory.

  - Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of     memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2025-0247)

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2025-0242)

  - The Matrix specification demands homeservers to perform validation of the server-name and media-id     components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a     similar check must also be performed on the client to prevent client-side path traversal. matrix-js-sdk     fails to perform this validation. (CVE-2024-50336)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

  - Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to     a potentially exploitable crash. (CVE-2025-0238)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 134.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-04 advisory.

  - Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of     memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2025-0247)

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2025-0242)

  - The Matrix specification demands homeservers to perform validation of the server-name and media-id     components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a     similar check must also be performed on the client to prevent client-side path traversal. matrix-js-sdk     fails to perform this validation. (CVE-2024-50336)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

  - Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to     a potentially exploitable crash. (CVE-2025-0238)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird ESR installed on the remote Windows host is prior to 128.6. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-05 advisory.

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2025-0242)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

  - Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to     a potentially exploitable crash. (CVE-2025-0238)

  - When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to     an insecure site. (CVE-2025-0239)

  - Parsing a JavaScript module as JSON could under some circumstances cause cross-compartment access, which     may result in a use-after-free. (CVE-2025-0240)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird ESR installed on the remote macOS or Mac OS X host is prior to 128.6. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-05 advisory.

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2025-0242)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

  - Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to     a potentially exploitable crash. (CVE-2025-0238)

  - When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to     an insecure site. (CVE-2025-0239)

  - Parsing a JavaScript module as JSON could under some circumstances cause cross-compartment access, which     may result in a use-after-free. (CVE-2025-0240)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:0144 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:0080 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:0132 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:0138 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:0134 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

    * firefox: Memory corruption when using JavaScript Text Segmentation (CVE-2025-0241)

    * firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and     Thunderbird 128.6 (CVE-2025-0243)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19,     Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

    * firefox: WebChannel APIs susceptible to confused deputy attack (CVE-2025-0237)

    * firefox: Compartment mismatch when parsing JavaScript JSON module (CVE-2025-0240)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-e8a71b6caf advisory.

    - Updated to latest upstream (134.0)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7191-1 advisory.

    Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially     crafted website, an attacker could potentially exploit these to cause a denial of service, obtain     sensitive information across domains, or execute arbitrary code. (CVE-2025-0237, CVE-2025-0239,     CVE-2025-0240, CVE-2025-0242, CVE-2025-0243, CVE-2025-0247)

    Irvan Kurniawan discovered that Firefox incorrectly handled memory when breaking lines in text, leading to     a use-after-free vulnerability. An attacker could possibly use this issue to cause a denial of service or     possibly execute arbitrary code. (CVE-2025-0238)

    Nils Bars discovered that Firefox incorrectly handled memory when using JavaScript Text Segmentation. An     attacker could possibly use this issue to cause a denial of service. (CVE-2025-0241)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of mozilla-firefox installed on the remote host is prior to 128.6.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-008-01 advisory.

    New mozilla-firefox packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-firefox security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5839 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-5839-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     January 08, 2025                      https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : firefox-esr     CVE ID         : CVE-2025-0237 CVE-2025-0238 CVE-2025-0239 CVE-2025-0240                      CVE-2025-0241 CVE-2025-0242 CVE-2025-0243

    Multiple security issues have been found in the Mozilla Firefox web     browser, which could potentially result in the execution of arbitrary     code or privilege escalation.

    For the stable distribution (bookworm), these problems have been fixed in     version 128.6.0esr-1~deb12u1.

    We recommend that you upgrade your firefox-esr packages.

    For the detailed security status of firefox-esr please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/firefox-esr

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-6fcde64d77 advisory.

    - Updated to latest upstream (134.0)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote Windows host is prior to 128.6. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-02 advisory.

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2025-0242)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

  - Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to     a potentially exploitable crash. (CVE-2025-0238)

  - When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to     an insecure site. (CVE-2025-0239)

  - Parsing a JavaScript module as JSON could under some circumstances cause cross-compartment access, which     may result in a use-after-free. (CVE-2025-0240)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 128.6. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-02 advisory.

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2025-0242)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

  - Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to     a potentially exploitable crash. (CVE-2025-0238)

  - When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to     an insecure site. (CVE-2025-0239)

  - Parsing a JavaScript module as JSON could under some circumstances cause cross-compartment access, which     may result in a use-after-free. (CVE-2025-0240)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote Windows host is prior to 134.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-01 advisory.

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2025-0242)

  - When redirecting to an invalid protocol scheme, an attacker could spoof the address bar.  Note: This issue     only affected Android operating systems. Other operating systems are unaffected. (CVE-2025-0244)

  - Under certain circumstances, a user opt-in setting that Focus should require authentication before use     could have been be bypassed. (CVE-2025-0245)

  - When using an invalid protocol scheme, an attacker could spoof the address bar.  Note: This issue only     affected Android operating systems. Other operating systems are unaffected. Note: This issue is a     different issue from CVE-2025-0244. (CVE-2025-0246)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 134.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-01 advisory.

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2025-0242)

  - When redirecting to an invalid protocol scheme, an attacker could spoof the address bar.  Note: This issue     only affected Android operating systems. Other operating systems are unaffected. (CVE-2025-0244)

  - Under certain circumstances, a user opt-in setting that Focus should require authentication before use     could have been be bypassed. (CVE-2025-0245)

  - When using an invalid protocol scheme, an attacker could spoof the address bar.  Note: This issue only     affected Android operating systems. Other operating systems are unaffected. Note: This issue is a     different issue from CVE-2025-0244. (CVE-2025-0246)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
213687	SUSE SLES12 Security Update : MozillaFirefox (SUSE-SU-2025:0056-1)	Nessus	SuSE Local Security Checks	medium
213642	RHEL 8 : firefox (RHSA-2025:0136)	Nessus	Red Hat Local Security Checks	medium
213641	RHEL 9 : firefox (RHSA-2025:0162)	Nessus	Red Hat Local Security Checks	medium
213640	RHEL 9 : firefox (RHSA-2025:0135)	Nessus	Red Hat Local Security Checks	medium
213638	RHEL 8 : firefox (RHSA-2025:0137)	Nessus	Red Hat Local Security Checks	medium
213637	RHEL 8 : firefox (RHSA-2025:0133)	Nessus	Red Hat Local Security Checks	medium
213633	Mozilla Thunderbird < 134.0	Nessus	Windows	medium
213632	Mozilla Thunderbird < 134.0	Nessus	MacOS X Local Security Checks	medium
213631	Mozilla Thunderbird ESR < 128.6	Nessus	Windows	medium
213630	Mozilla Thunderbird ESR < 128.6	Nessus	MacOS X Local Security Checks	medium
213629	RHEL 8 : firefox (RHSA-2025:0144)	Nessus	Red Hat Local Security Checks	medium
213623	RHEL 9 : firefox (RHSA-2025:0080)	Nessus	Red Hat Local Security Checks	medium
213619	RHEL 7 : firefox (RHSA-2025:0132)	Nessus	Red Hat Local Security Checks	medium
213618	RHEL 9 : firefox (RHSA-2025:0138)	Nessus	Red Hat Local Security Checks	medium
213614	RHEL 8 : firefox (RHSA-2025:0134)	Nessus	Red Hat Local Security Checks	medium
213613	Fedora 40 : firefox (2025-e8a71b6caf)	Nessus	Fedora Local Security Checks	high
213603	Ubuntu 20.04 LTS : Firefox vulnerabilities (USN-7191-1)	Nessus	Ubuntu Local Security Checks	high
213599	Slackware Linux 15.0 / current mozilla-firefox Multiple Vulnerabilities (SSA:2025-008-01)	Nessus	Slackware Local Security Checks	medium
213575	Debian dsa-5839 : firefox-esr - security update	Nessus	Debian Local Security Checks	medium
213553	Fedora 41 : firefox (2025-6fcde64d77)	Nessus	Fedora Local Security Checks	high
213532	Mozilla Firefox ESR < 128.6	Nessus	Windows	high
213531	Mozilla Firefox ESR < 128.6	Nessus	MacOS X Local Security Checks	high
213528	Mozilla Firefox < 134.0	Nessus	Windows	high
213527	Mozilla Firefox < 134.0	Nessus	MacOS X Local Security Checks	high

Detections

Analytics

CVE-2025-0240

medium

Tenable Plugins

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