Description
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenVPN | OpenVPN | 2.6.1 – ≤ 2.6.13 | — |
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 | 2.6.14-1 | — |
| Debian 13 | openvpn | 2.6.14-1 | — |
| Debian 12 | openvpn | 2.6.3-1+deb12u3 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | openvpn | 2.6.12-0ubuntu0.24.04.3 | USN-7411-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openvpn +1 | 2.6.8-150600.3.17.1 | SUSE-SU-2025:01508-1 |
| SLES 15 SP6 | openvpn +1 | 2.6.8-150600.3.17.1 | SUSE-SU-2025:1508-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openvpn | 2.6.14-1.1 | openSUSE-SU-2025:14979-1 |
| openSUSE Leap 15.6 | openvpn +1 | 2.6.8-150600.3.17.1 | SUSE-SU-2025:1508-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openvpn | 2.6.14-r0 | — |
| Alpine v3.23 | openvpn | 2.6.14-r0 | — |
| Alpine v3.22 | openvpn | 2.6.14-r0 | — |
| Alpine v3.21 | openvpn | 2.6.14-r0 | — |
| Alpine v3.20 | openvpn | 2.6.16-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | openvpn | 2.6.16-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openvpn +1 | 2.6.12-1.amzn2023.0.2 | ALAS2023-2025-967 |
Advisories 6
- SUSE-SU-2025:01508-1 Security update for openvpn SUSE / openSUSE Security Updates · Mar 23, 2026
- USN-7411-1 openvpn vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2025:1508-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14979-1 openvpn-2.6.14-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0694 OpenVPN: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jun 9, 2025
- ALAS2023-2025-967 Moderate: openvpn security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 13, 2025