OpenVPN before 2.6.11 does not santize PUSH_REPLY messages properly which an attacker controlling the server can use to inject unexpected arbitrary data ending up in client logs.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2025:1131-1 advisory.

    - CVE-2024-5594: Fixed incorrect handling of  null bytes and invalid characters in control messages     (bsc#1235147)

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

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

The remote SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2025:1053-2 advisory.

    - CVE-2024-5594: Fixed handling of null bytes and invalid characters in control messages (bsc#1235147).

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

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

The remote SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2025:1053-1 advisory.

    - CVE-2024-5594: Fixed handling of null bytes and invalid characters in control messages (bsc#1235147).

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

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

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7340-1 advisory.

    It was discovered that OpenVPN did not perform proper input validation when generating a TLS key under     certain configuration, which could lead to a buffer overflow. An attacker could possibly use this issue to     cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu     16.04 LTS. (CVE-2017-12166)

    Reynir Bjrnsson discovered that OpenVPN incorrectly handled certain control channel messages with     nonprintable characters. A remote attacker could possibly use this issue to cause OpenVPN to consume     resources, or fill up log files with garbage, leading to a denial of service. (CVE-2024-5594)

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 remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4079 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4079-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                        Aquila Macedo     March 08, 2025                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : openvpn     Version        : 2.5.1-3+deb11u1     CVE ID         : CVE-2022-0547 CVE-2024-5594     Debian Bug     : 1008015 1074488 1086653

    Two vulnerabilities were discovered in openvpn, a virtual private     network application which could result in authentication bypass or     data injection.

    CVE-2022-0547

        OpenVPN may enable authentication bypass in external         authentication plug-ins when more than one of them makes use of         deferred authentication replies, which allows an external user to         be granted access with only partially correct credentials.

    CVE-2024-5594

        OpenVPN does not sanitize PUSH_REPLY messages properly which         attackers can use to inject unexpected arbitrary data into         third-party executables or plug-ins.

    For Debian 11 bullseye, these problems have been fixed in version     2.5.1-3+deb11u1.

    We recommend that you upgrade your openvpn packages.

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

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

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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - OpenVPN before 2.6.11 does not santize PUSH_REPLY messages properly which attackers can use to inject     unexpected arbitrary data into third-party executables or plug-ins. (CVE-2024-5594)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2025:0278-1 advisory.

    - CVE-2024-5594: Fixed wrong handling of null bytes and invalid characters in control messages     (bsc#1235147)

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

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

control channel: refuse control channel messages with nonprintable characters in them. Security scope: a malicious openvpn peer can send garbage to openvpn log, or cause high CPU load

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

The remote Ubuntu 20.04 LTS / 22.04 LTS / 23.10 / 24.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6860-1 advisory.

    Reynir Bjrnsson discovered that OpenVPN incorrectly handled terminating client connections. A remote     authenticated client could possibly use this issue to keep the connection active, bypassing certain     security policies. This issue only affected Ubuntu 23.10, and Ubuntu 24.04 LTS. (CVE-2024-28882)

    Reynir Bjrnsson discovered that OpenVPN incorrectly handled certain control channel messages with     nonprintable characters. A remote attacker could possibly use this issue to cause OpenVPN to consume     resources, or fill up log files with garbage, leading to a denial of service. (CVE-2024-5594)

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 remote Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-b611e122fb advisory.

    Update to upstream OpenVPN 2.6.11     CVE-2024-5594: control channel: refuse control channel messages with nonprintable characters in them     CVE-2024-28882: only call schedule_exit() once (on a given peer)

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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 142c538e-b18f-40a1-afac-c479effadd5c advisory.

    Gert Doering reports that OpenVPN 2.6.11 fixes two security bugs (three on Windows):
    CVE-2024-5594: control channel: refuse control channel messages with nonprintable characters in them.
    Security scope: a malicious openvpn peer can send garbage to openvpn log, or cause high CPU load. (Reynir     Bjrnsson)     CVE-2024-28882: only call schedule_exit() once (on a given peer). Security scope: an authenticated client     can make the server keep the session even when the server has been told to disconnect this client.
    (Reynir Bjrnsson)

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

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
233834	SUSE SLES15 Security Update : openvpn (SUSE-SU-2025:1131-1)	Nessus	SuSE Local Security Checks	critical
233754	SUSE SLES12 Security Update : openvpn (SUSE-SU-2025:1053-2)	Nessus	SuSE Local Security Checks	critical
233487	SUSE SLES12 Security Update : openvpn (SUSE-SU-2025:1053-1)	Nessus	SuSE Local Security Checks	critical
232579	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : OpenVPN vulnerabilities (USN-7340-1)	Nessus	Ubuntu Local Security Checks	critical
232531	Debian dla-4079 : openvpn - security update	Nessus	Debian Local Security Checks	critical
231274	Linux Distros Unpatched Vulnerability : CVE-2024-5594	Nessus	Misc.	critical
214756	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : openvpn (SUSE-SU-2025:0278-1)	Nessus	SuSE Local Security Checks	critical
502669	Siemens SCALANCE M-800 Improper Output Neutralization For Logs (CVE-2024-5594)	Tenable OT Security	Tenable.ot	critical
201237	Ubuntu 20.04 LTS / 22.04 LTS / 23.10 / 24.04 LTS : OpenVPN vulnerabilities (USN-6860-1)	Nessus	Ubuntu Local Security Checks	critical
201065	Fedora 40 : openvpn (2024-b611e122fb)	Nessus	Fedora Local Security Checks	critical
200822	FreeBSD : openvpn -- two security fixes (142c538e-b18f-40a1-afac-c479effadd5c)	Nessus	FreeBSD Local Security Checks	critical

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CVE-2024-5594

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