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 version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2025:0091 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2024-5594:
    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-2024-28882:
    OpenVPN from 2.6.0 through 2.6.10 in a server role accepts multiple exit notifications from authenticated     clients which will extend the validity of a closing session

    CVE-2024-27459:
    The interactive service in OpenVPN 2.6.9 and earlier allows an attacker to send data causing a stack     overflow which can be used to execute arbitrary code with more privileges.

    CVE-2024-24974:
    The interactive service in OpenVPN 2.6.9 and earlier allows the OpenVPN service pipe to be accessed     remotely, which allows a remote attacker to interact with the privileged OpenVPN interactive service.

Tenable has extracted the preceding description block directly from the Tencent 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.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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. (CVE-2024-5594)

  - OpenVPN from 2.6.0 through 2.6.10 in a server role accepts multiple exit notifications from authenticated
    clients which will extend the validity of a closing session (CVE-2024-28882)

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 a vulnerability as referenced in the dla-4079 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4079-2                debian-lts@lists.debian.org     https://www.debian.org/lts/security/          Carlos Henrique Lima Melara     August 31, 2025                               https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : openvpn     Version        : 2.5.1-3+deb11u2     CVE ID         :
    Debian Bug     : 1112516

    The upstream fix for CVE-2024-5594 released in DLA-4079-1 restricted characters     in control channel messages including \n and \r, but many scripts add them.
    This regression fix basically allows \n and \r in the control channel messages.

    For Debian 11 bullseye, this problem has been fixed in version     2.5.1-3+deb11u2.

    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     Attachment:
    signature.asc     Description: PGP signature

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2024-5594)

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
239514	TencentOS Server 4: openvpn (TSSA-2025:0091)	Nessus	Tencent Local Security Checks	high
424315	Alpine: multiple openvpn packages: security update to 2.6.11-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
424315	Alpine: multiple openvpn packages: security update to 2.6.11-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
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
214756	SUSE SLED15: openvpn / openvpn-auth-pam-plugin / openvpn-dco / openvpn-dco-devel / etc (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
408467	Alpine: openvpn: security update to 2.5.10-r1	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
408467	Alpine: openvpn: security update to 2.5.10-r1	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	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

Detections

Analytics

CVE-2024-5594

critical

Tenable Plugins

high

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical