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Vulnerability record · CVE-2022-0547 · published 18 March 2022

CVE-2022-0547: Openvpn improper authentication vulnerability

Openvpn · Openvpn

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.

9.8 CVSS 3.1 Critical EPSS 3.6% · top 11.0% CWE-305 · CWE-305CWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 7.5
3.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
13References
17 Jun 2026Last modified by NVD

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://community.openvpn.net/openvpn/wiki/CVE-2022-0547 Vendor Advisory
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GFXJ35WKPME4HYNQCQNAJHL
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R36OYC5SJ6FLPVAYJYYT4MO
https://openvpn.net/community-downloads/ PatchVendor Advisory
https://community.openvpn.net/openvpn/wiki/CVE-2022-0547 Vendor Advisory
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html Mailing ListThird 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/GFXJ35WKPME4HYNQCQNAJHL
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R36OYC5SJ6FLPVAYJYYT4MO
https://openvpn.net/community-downloads/ PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2022-0547), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.