Description
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.
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 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openvpn | 2.5.3-1.2 | openSUSE-SU-2024:11128-1 |
Advisories 1
- openSUSE-SU-2024:11128-1 openvpn-2.5.3-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243
- 1038768 vdb-entry
- 99230 vdb-entry