OpenVPN fixes 1 vulnerability

Do you think this report is well-written? *

Yes

Do you use this technology? *

Yes

Was this report useful to you?

Yes

We would be happy if you would describe:

The security services provided by CESNET are designed to provide significant support in ensuring the cybersecurity of connected organizations. Although we strive to provide quality and reliable services, it is not possible to guarantee absolute coverage of all security vulnerabilities. Our services should be seen as a complement to an organization's own security management, not as a replacement. The client bears ultimate responsibility for securing their environment.

This report was translated by AI; nobody has reviewed the translation yet. Original language: Slovak.

[TLP:CLEAR] OpenVPN fixes 1 vulnerability

OpenVPN fixes 1 vulnerability in version 2.6.14 [1]. None of the popular operating systems has released a fix yet.

OpenVPN - DoS (CVE-2025-2704)

CVSS 7.5 (High)

An authenticated remote attacker can cause a DoS attack on the OpenVPN server by sending specially crafted packets. To exploit the vulnerability, the instance must be running with the "--tls-crypt-v2" option, and the attacker must also have a valid tls-crypt-v2 key available, which, however, can be stolen from a MITM position [1].

The vulnerability is present in product:

OpenVPN; >=2.6.1, <2.6.14;

CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

More information:

CVE-2025-2704 at cve.org, NVD
CWE-754: Improper Check for Unusual or Exceptional Conditions at cwe.mitre.org

The vulnerability was publicly disclosed 2. 4. 2025.

Report feedback

[TLP:CLEAR] OpenVPN fixes 1 vulnerability

OpenVPN - DoS (CVE-2025-2704)

CVSS 7.5 (High)

Links