Home/CVE/OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than
CVE

CVE-2022-0547

OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than

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.

CRITICAL · CVSS 9.8 EPSS 0.00465
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-287Improper Authentication
CWE-305Authentication Bypass by Primary Weakness
▤

Affected Products & Versions

4
openvpn>= 2.1.0 and < 2.4.12
openvpn>= 2.5.0 and < 2.5.6
fedoraproject fedoraall versions
debian linuxall versions
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · security@openvpn.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Mar 2022 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

12
usnUSN-6850-1
suse-csafopenSUSE-SU-2024:11968-1
siemens-csafSSA-942865
siemens-csafSSA-419740
suse-csafSUSE-SU-2022:1934-1
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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 ListThird 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/PatchVendor Advisory
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