CVE-2022-0547

Name: CVE-2022-0547
Creator: NVD / NIST
Published: 2022-03-18T18:15:12.017+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.52%

Last modified Jun 17, 2026

CVE-2022-0547 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 3.52% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.52%

87.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Openvpn	Openvpn	>= 2.1.0, < 2.4.12
Openvpn	Openvpn	>= 2.5.0, < 2.5.6
Fedoraproject	Fedora	34
Fedoraproject	Fedora	36
Debian	Debian Linux	9.0

References

https://community.openvpn.net/openvpn/wiki/CVE-2022-0547Vendor Advisory
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncementsVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GFXJ35WKPME4HYNQCQNAJHLCZOJL2SAE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R36OYC5SJ6FLPVAYJYYT4MOJ2I7MGYFF/
https://openvpn.net/community-downloads/Patch, Vendor Advisory
https://community.openvpn.net/openvpn/wiki/CVE-2022-0547Vendor Advisory
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncementsVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/03/msg00005.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GFXJ35WKPME4HYNQCQNAJHLCZOJL2SAE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R36OYC5SJ6FLPVAYJYYT4MOJ2I7MGYFF/
https://openvpn.net/community-downloads/Patch, Vendor Advisory

Timeline

Published: Mar 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-0547?

How severe is CVE-2022-0547?

CVE-2022-0547 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.52% probability of exploitation in the next 30 days.

How do I fix CVE-2022-0547?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-0547?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST