OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase

vendor_unpatched cve-2025-2704: Unpatched CVEs for Debian Linux (cve-2025-2704)

The remote Fedora 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-277b5e1d96 advisory.

    Update to upstream OpenVPN 2.6.14     Fixes CVE-2025-2704


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

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

OpenVPN from 2.6.1 through 2.6.13, setup with tls-crypt-v2. is affected by a denial of service vulnerability.  A local attacker who can monitor network traffic, can inject specially crafted packets during the tls-crypt2-v2 handshake and corrupt the server.

The remote Ubuntu 24.04 LTS / 24.10 host has a package installed that is affected by a vulnerability as referenced in the USN-7411-1 advisory.

    It was discovered that OpenVPN incorrectly handled certain malformed packets. A remote attacker could     possibly use this issue to cause OpenVPN to crash, resulting in a denial of service.

Tenable has extracted the preceding description block directly from the Ubuntu 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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 2cad4541-0f5b-11f0-89f8-411aefea0df9 advisory.

    Gert Doering reports:
    OpenVPN servers between 2.6.1 and 2.6.13 using
                --tls-crypt-v2 can be made to abort with an ASSERT() message by                 sending a particular combination of authenticated and malformed packets.
    To trigger the bug, a valid tls-crypt-v2 client key is needed, or                 network observation of a handshake with a valid tls-crypt-v2 client key     No crypto integrity is violated, no data is leaked, and no remote                 code execution is possible.
    This bug does not affect OpenVPN clients.

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

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

ID	Name	Product	Family	Severity
233986	Fedora 41 : openvpn (2025-277b5e1d96)	Nessus	Fedora Local Security Checks	high
233860	OpenVPN Server versions 2.6.1 <= 2.6.13 DoS	Nessus	Windows	high
233827	Ubuntu 24.04 LTS / 24.10 : OpenVPN vulnerability (USN-7411-1)	Nessus	Ubuntu Local Security Checks	high
233819	FreeBSD : openvpn -- server-side denial-of-service vulnerability with tls-crypt-v2 (2cad4541-0f5b-11f0-89f8-411aefea0df9)	Nessus	FreeBSD Local Security Checks	high

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CVE-2025-2704

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