CVE-2025-2704

Publication date 2 April 2025

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openvpn	24.10 oracular	Fixed 2.6.12-1ubuntu1.2
	24.04 LTS noble	Fixed 2.6.12-0ubuntu0.24.04.3
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

per upstream, only affects 2.6+

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H