Description
OpenVPN before 2.6.11 does not santize PUSH_REPLY messages properly which an attacker controlling the server can use to inject unexpected arbitrary data ending up in client logs.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenVPN | OpenVPN | < 2.6.11 | 2.6.11 |
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 | 2.6.11-1 | — |
| Debian 13 | openvpn | 2.6.11-1 | — |
| Debian 12 | openvpn | 2.6.3-1+deb12u3 | — |
| Debian 11 | openvpn | 2.5.1-3+deb11u1 | DLA-4079-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | openvpn | 2.6.9-1ubuntu4.1 | USN-6860-1 |
| Ubuntu 22.04 LTS | openvpn | 2.5.9-0ubuntu0.22.04.3 | USN-6860-1 |
| Ubuntu 20.04 LTS | openvpn | 2.4.12-0ubuntu0.20.04.2 | USN-6860-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | openvpn | 2.4.4-2ubuntu1.7+esm1 | USN-7340-1 |
| Ubuntu Pro 16.04 LTS | openvpn | 2.3.10-1ubuntu2.2+esm2 | USN-7340-1 |
| Ubuntu Pro 14.04 LTS | openvpn | 2.3.2-7ubuntu3.2+esm2 | USN-7340-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | openvpn +1 | 2.6.8-150600.3.14.1 | SUSE-SU-2025:0278-1 |
| SLES 15 SP5 | openvpn | 2.5.6-150400.3.9.1 | SUSE-SU-2025:1131-1 |
| SLES 15 SP4 | openvpn | 2.5.6-150400.3.9.1 | SUSE-SU-2025:1131-1 |
| SLES 12 SP5 | openvpn | 2.3.8-16.35.1 | SUSE-SU-2025:1053-2, SUSE-SU-2025:1053-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | openvpn | 2.5.6-150400.3.9.1 | SUSE-SU-2025:1131-1 |
| SLES for SAP 15 SP4 | openvpn | 2.5.6-150400.3.9.1 | SUSE-SU-2025:1131-1 |
| SLE HPC 15 SP5 | openvpn | 2.5.6-150400.3.9.1 | SUSE-SU-2025:1131-1 |
| SLE HPC 15 SP4 | openvpn | 2.5.6-150400.3.9.1 | SUSE-SU-2025:1131-1 |
| SUSE Manager Server 4.3 | openvpn | 2.5.6-150400.3.9.1 | SUSE-SU-2025:1131-1 |
| SUSE Manager Proxy 4.3 | openvpn | 2.5.6-150400.3.9.1 | SUSE-SU-2025:1131-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openvpn | 2.6.10-5.1 | openSUSE-SU-2025:14707-1 |
| openSUSE Leap 15.6 | openvpn +1 | 2.6.8-150600.3.14.1 | SUSE-SU-2025:0278-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openvpn | 2.6.11-r0 | — |
| Alpine v3.23 | openvpn | 2.6.11-r0 | — |
| Alpine v3.22 | openvpn | 2.6.11-r0 | — |
| Alpine v3.21 | openvpn | 2.6.11-r0 | — |
| Alpine v3.20 | openvpn | 2.6.11-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | openvpn | 2.6.11-r0 | — |
| Alpine v3.18 | openvpn | 2.6.11-r0 | — |
| Alpine v3.17 | openvpn | 2.5.10-r1 | — |
Advisories 16
- USN-7340-1 openvpn vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-4079-1 openvpn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-6860-1 openvpn vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2025:1053-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14707-1 openvpn-2.6.10-5.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1131-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0278-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1053-2 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- VDE-2025-053 Phoenix Contact: Multiple Vulnerabilities in PLCnext Firmware CERT@VDE · Jul 8, 2025
- ICSA-24-319-06 Siemens SCALANCE M-800 Family CISA ICS & IT advisories · May 6, 2025
- WID-SEC-2024-1433 OpenVPN: Mehrere Schwachstellen ermöglichen Denial of Service und Privilegieneskalation BSI CERT-Bund (WID) · Apr 3, 2025
- NCSC-2025-0077 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Mar 11, 2025
- ICSA-25-072-02 Siemens SINEMA Remote Connect Server CISA ICS & IT advisories · Mar 11, 2025
- SSA-073066 SSA-073066: Multiple Vulnerabilities in SINEMA Remote Connect Server Before V3.2 SP3 Siemens ProductCERT · Mar 11, 2025
- NCSC-2024-0433 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Nov 12, 2024
- SSA-354112 SSA-354112: Multiple Vulnerabilities in SCALANCE M-800 Family Before V8.2 Siemens ProductCERT · Nov 12, 2024