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.

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

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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
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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