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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 one of them makes use of deferred authentication replies, which allows an ex...
CVE-2022-0547 · published 4 years ago
Summary
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.
What to do
- Update debian openvpn to version 2.5.6-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| – | openvpn | openvpn |
>= 2.1.0, < 2.4.12 >= 2.5.0, < 2.5.6 cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:* |
| – | fedoraproject | fedora |
34 36 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* |
| – | debian | debian_linux |
9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| Debian:12 | debian | openvpn |
< 2.5.6-1 Fix: upgrade to 2.5.6-1
|
Original advisory text
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 ex...
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.
References
- https://community.openvpn.net/openvpn/wiki/CVE-2022-0547 URL
- https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements URL
- https://lists.debian.org/debian-lts-announce/2025/03/msg00005.html URL
- https://openvpn.net/community-downloads/ URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/0xxx/CVE-2022-0547.j... Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro... Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2022-0547 Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2022-0547 Vendor Advisory
Internet-facing
3 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker full control
Type
CWE-305Authentication Bypass by Primary Weakness
CWE-287Improper Authentication
Timeline
Published18 Mar 2022
Updated30 Oct 2026
First seen29 Sep 2026
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