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Vulnerability · Published Mar 18, 2022 · Assigned by OpenVPN

CVE-2022-0547

Critical 9.8

In plain English

A critical-severity security flaw in OpenVPN. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.5% (higher than 89% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)3.5%top 10.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20openvpn2.5.6-r0ALPINE-CVE-2022-0547
Alpine:v3.21openvpn2.5.6-r0ALPINE-CVE-2022-0547
Alpine:v3.22openvpn2.5.6-r0ALPINE-CVE-2022-0547
Alpine:v3.23openvpn2.5.6-r0ALPINE-CVE-2022-0547
Alpine:v3.24openvpn2.5.6-r0ALPINE-CVE-2022-0547
Debian:12openvpn2.5.6-1DEBIAN-CVE-2022-0547
Debian:13openvpn2.5.6-1DEBIAN-CVE-2022-0547
Debian:14openvpn2.5.6-1DEBIAN-CVE-2022-0547
Ubuntu:22.04:LTSopenvpn2.5.5-1ubuntu3UBUNTU-CVE-2022-0547

Affected products (as reported)

VendorProductVersions
n/a OpenVPN version 2.1 until version 2.4.12 and 2.5.6.

Weakness: CWE-305 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References