Description
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service when receiving malformed IPv6 packet.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenVPN Technologies | OpenVPN | before 2.4.3, before 2.3.17 | — |
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 | 2.4.3-1 | — |
| Debian 13 | openvpn | 2.4.3-1 | — |
| Debian 12 | openvpn | 2.4.3-1 | — |
| Debian 9 | openvpn | 2.4.0-6+deb9u1 | DSA-3900-1 |
| Debian 8 | openvpn | 2.3.4-5+deb8u2 | DSA-3900-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | openvpn | 2.3.10-1ubuntu2.1 | USN-3339-1 |
| Ubuntu 14.04 LTS | openvpn | 2.3.2-7ubuntu3.2 | USN-3339-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | openvpn | 2.3.8-16.17.1 | SUSE-SU-2017:1635-1 |
| SLES 12 SP1 | openvpn | 2.3.8-16.17.1 | SUSE-SU-2017:1635-1 |
| SLES 12 | openvpn | 2.3.8-16.17.1 | SUSE-SU-2017:1635-1 |
| SLES 11 SP4 | openvpn | 2.0.9-143.46.1 | SUSE-SU-2017:1642-1 |
| SLES 11 SP3 | openvpn | 2.0.9-143.46.1 | SUSE-SU-2017:1642-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 | openvpn-openssl1 | 2.3.2-0.9.1 | SUSE-SU-2017:1718-1 |
| SLES for SAP 12 SP2 | openvpn | 2.3.8-16.17.1 | SUSE-SU-2017:1635-1 |
| SLES for SAP 12 SP1 | openvpn | 2.3.8-16.17.1 | SUSE-SU-2017:1635-1 |
| SLES for SAP 12 | openvpn | 2.3.8-16.17.1 | SUSE-SU-2017:1635-1 |
| SLES for SAP 11 SP4 | openvpn | 2.0.9-143.46.1 | SUSE-SU-2017:1642-1 |
| SUSE OpenStack Cloud 6 | openvpn | 2.3.8-16.17.1 | SUSE-SU-2017:1635-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | openvpn | 2.0.9-143.46.1 | SUSE-SU-2017:1642-1 |
Advisories 5
- DSA-3900-1 openvpn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3339-1 openvpn vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:1718-1 Security update for openvpn-openssl1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1642-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1635-1 Security update for openvpn SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243
- 1038768 vdb-entry
- 99230 vdb-entry
- DSA-3900 vendor-advisory