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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-2992-1 openvpn security update
Debian DLA Debian DLA DLA-4079-1 openvpn security update
EUVD EUVD EUVD-2022-15669 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.
Ubuntu USN Ubuntu USN USN-5347-1 OpenVPN vulnerability
Ubuntu USN Ubuntu USN USN-6850-1 OpenVPN vulnerability
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 03 Nov 2025 21:30:00 +0000

Type Values Removed Values Added
References

Wed, 23 Apr 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: OpenVPN

Published:

Updated: 2025-11-03T20:34:30.191Z

Reserved: 2022-02-08T00:00:00.000Z

Link: CVE-2022-0547

cve-icon Vulnrichment

Updated: 2025-11-03T20:34:30.191Z

cve-icon NVD

Status : Modified

Published: 2022-03-18T18:15:12.017

Modified: 2025-11-03T21:15:49.843

Link: CVE-2022-0547

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses