Authentication bypass in OpenVPN
Priority MEDIUM 55CWE-305Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-287.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03478 89th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | OpenVPN | version 2.1 until version 2.4.12 and 2.5.6. | — | No fix listed | CNA |
- OpenVPN Vendor— Affected version 2.1 until version 2.4.12 and 2.5.6. Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:* | 2.1.0 to before 2.4.12; 2.5.0 to before 2.5.6 | Vulnerable | OpenVPN |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* | 36 | Vulnerable | Fedoraproject |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:* Versions 2.1.0 to before 2.4.12; 2.5.0 to before 2.5.6 Vulnerable ·OpenVPN
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2022-0547
- 2026-10-03 Alias added: GHSA-g28r-w65r-h89m
References
Sources
- CVE-2022-0547 · CVE Program
- CVE-2022-0547 · NVD
- FIRST EPSS
- GHSA-g28r-w65r-h89m · GitHub Advisory Database · CC BY 4.0
- CVE-2022-0547 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences