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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | OpenVPN | version 2.1 until version 2.4.12 and 2.5.6. | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openvpn | 2.5.6-1 | — |
| Debian 13 | openvpn | 2.5.6-1 | — |
| Debian 12 | openvpn | 2.5.6-1 | — |
| Debian 11 | openvpn | 2.5.1-3+deb11u1 | DLA-4079-1 |
| Debian 9 | openvpn | 2.4.0-6+deb9u4 | DLA-2992-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | openvpn | 2.5.5-1ubuntu3 | — |
| Ubuntu 20.04 LTS | openvpn | 2.4.7-1ubuntu2.20.04.4 | USN-5347-1 |
| Ubuntu 18.04 LTS | openvpn | 2.4.4-2ubuntu1.7 | USN-5347-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | openvpn | 2.3.10-1ubuntu2.2+esm1 | USN-6850-1 |
| Ubuntu Pro 14.04 LTS | openvpn | 2.3.2-7ubuntu3.2+esm1 | USN-6850-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | openvpn | 2.5.6-150400.3.3.1 | SUSE-SU-2022:1934-1 |
| SLES 15 SP3 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLES 15 SP2 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLES 15 SP1 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLES 15 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
Show 25 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SLES 12 SP4 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SLES 12 SP3 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SLES 12 SP2 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SLES 11 | openvpn-openssl1 | 2.3.2-0.10.12.1 | SUSE-SU-2022:14937-1 |
| SLES for SAP 15 SP2 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLES for SAP 15 SP1 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLES for SAP 15 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLES for SAP 12 SP5 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SLES for SAP 12 SP4 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SLES for SAP 12 SP3 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SLE Real Time 15 SP2 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLE HPC 15 SP2 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLE HPC 15 SP1 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SLE HPC 15 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SUSE OpenStack Cloud Crowbar 9 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SUSE OpenStack Cloud Crowbar 8 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SUSE OpenStack Cloud 9 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SUSE OpenStack Cloud 8 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SUSE Manager Server 4.1 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SUSE Manager Retail Branch Server 4.1 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SUSE Manager Proxy 4.1 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SUSE HPE Helion OpenStack 8 | openvpn | 2.3.8-16.29.1 | SUSE-SU-2022:1024-1 |
| SUSE Enterprise Storage 7 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
| SUSE Enterprise Storage 6 | openvpn | 2.4.3-150000.5.10.1 | SUSE-SU-2022:1029-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openvpn | 2.5.6-1.1 | openSUSE-SU-2024:11968-1 |
| openSUSE Leap 15.4 | openvpn | 2.5.6-150400.3.3.1 | SUSE-SU-2022:1934-1 |
| openSUSE Leap 15.3 | openvpn | 2.4.3-150000.5.10.1 | openSUSE-SU-2022:1029-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openvpn | 2.5.6-r0 | — |
| Alpine v3.23 | openvpn | 2.5.6-r0 | — |
| Alpine v3.22 | openvpn | 2.5.6-r0 | — |
| Alpine v3.21 | openvpn | 2.5.6-r0 | — |
| Alpine v3.20 | openvpn | 2.5.6-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | openvpn | 2.5.6-r0 | — |
| Alpine v3.18 | openvpn | 2.5.6-r0 | — |
| Alpine v3.17 | openvpn | 2.5.6-r0 | — |
| Alpine v3.16 | openvpn | 2.5.6-r0 | — |
| Alpine v3.15 | openvpn | 2.5.6-r0 | — |
| Alpine v3.14 | openvpn | 2.5.6-r0 | — |
| Alpine v3.13 | openvpn | 2.5.6-r0 | — |
| Alpine v3.12 | openvpn | 2.4.12-r0 | — |
Advisories 16
- USN-6850-1 openvpn vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- DLA-2992-1 openvpn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4079-1 openvpn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-5347-1 openvpn vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:11968-1 openvpn-2.5.6-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1024-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:14937-1 Security update for openvpn-openssl1 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:1029-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1934-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1029-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- VDE-2022-046 PHOENIX CONTACT: Multiple Linux component vulnerabilities in PLCnext Firmware CERT@VDE · May 22, 2025
- WID-SEC-2022-0116 OpenVPN: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Mar 9, 2025
- ICSA-23-166-12 Siemens SINAMICS Medium Voltage Products CISA ICS & IT advisories · Jun 14, 2023
- SSA-942865 SSA-942865: Multiple Vulnerabilities in the Integrated SCALANCE S615 of SINAMICS Medium Voltage Products Siemens ProductCERT · Jun 14, 2023
- ICSA-23-075-01 Siemens SCALANCE, RUGGEDCOM Third-Party CISA ICS & IT advisories · Mar 14, 2023
- SSA-419740 SSA-419740: Multiple Third-Party Component Vulnerabilities in RUGGEDCOM and SCALANCE Products before V7.2 Siemens ProductCERT · Mar 14, 2023
References
- https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements
- https://community.openvpn.net/openvpn/wiki/CVE-2022-0547
- https://openvpn.net/community-downloads/
- FEDORA-2022-7d46acce7c vendor-advisory
- FEDORA-2022-cb4c1146dc vendor-advisory
- [debian-lts-announce] 20220503 [SECURITY] [DLA 2992-1] openvpn security update mailing-list