CVE-2022-0547

Publication date 18 March 2022

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than one of them makes use of deferred authentication replies, which allows an external user to be granted access with only partially correct credentials.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openvpn	24.04 LTS noble	Fixed 2.5.5-1ubuntu3
	23.10 mantic	Fixed 2.5.5-1ubuntu3
	23.04 lunar	Fixed 2.5.5-1ubuntu3
	22.10 kinetic	Fixed 2.5.5-1ubuntu3
	22.04 LTS jammy	Fixed 2.5.5-1ubuntu3
	21.10 impish	Fixed 2.5.1-3ubuntu1.1
	20.04 LTS focal	Fixed 2.4.7-1ubuntu2.20.04.4
	18.04 LTS bionic	Fixed 2.4.4-2ubuntu1.7
	16.04 LTS xenial	Fixed 2.3.10-1ubuntu2.2+esm1
	14.04 LTS trusty	Fixed 2.3.2-7ubuntu3.2+esm1

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
openvpn	Upstream: 58ec3bb Upstream: af3e382

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H