Description
OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability when key-method 1 is used, possibly resulting in code execution.
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 | 2.4.4-1 | — |
| Debian 13 | openvpn | 2.4.4-1 | — |
| Debian 12 | openvpn | 2.4.4-1 | — |
| Debian 9 | openvpn | 2.4.0-6+deb9u4 | DLA-2992-1 |
Ubuntu
Security tracker ↗| 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 12 SP3 | openvpn | 2.3.8-16.20.1 | SUSE-SU-2017:2839-1 |
| SLES 12 SP2 | openvpn | 2.3.8-16.20.1 | SUSE-SU-2017:2839-1 |
| SLES 12 SP1 | openvpn | 2.3.8-16.20.1 | SUSE-SU-2017:2839-1 |
| SLES 12 | openvpn | 2.3.8-16.20.1 | SUSE-SU-2017:2839-1 |
| SLES 11 SP4 | openvpn | 2.0.9-143.47.3.1 | SUSE-SU-2017:2838-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | openvpn | 2.0.9-143.47.3.1 | SUSE-SU-2017:2838-1 |
| SLES 11 | openvpn-openssl1 | 2.3.2-0.10.3.1 | SUSE-SU-2017:3177-1 |
| SLES for SAP 12 SP3 | openvpn | 2.3.8-16.20.1 | SUSE-SU-2017:2839-1 |
| SLES for SAP 12 SP2 | openvpn | 2.3.8-16.20.1 | SUSE-SU-2017:2839-1 |
| SLES for SAP 12 SP1 | openvpn | 2.3.8-16.20.1 | SUSE-SU-2017:2839-1 |
| SLES for SAP 11 SP4 | openvpn | 2.0.9-143.47.3.1 | SUSE-SU-2017:2838-1 |
| SUSE OpenStack Cloud 6 | openvpn | 2.3.8-16.20.1 | SUSE-SU-2017:2839-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | openvpn | 2.0.9-143.47.3.1 | SUSE-SU-2017:2838-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openvpn | 2.5.3-1.2 | openSUSE-SU-2024:11128-1 |
Advisories 7
- USN-7340-1 openvpn vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-2992-1 openvpn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2839-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2838-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11128-1 openvpn-2.5.3-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:3177-1 Security update for openvpn-openssl1 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0513 OpenVPN: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Mar 10, 2025