Description
Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenVPN | OpenVPN 2 (Community) | 2.6.0 – ≤ 2.6.6 | — |
| OpenVPN | Access Server | 2.11.0 – ≤ 2.11.3, 2.12.0 – ≤ 2.12.2 | — |
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 | 2.6.7-1 | — |
| Debian 13 | openvpn | 2.6.7-1 | — |
| Debian 12 | openvpn | 2.6.3-1+deb12u2 | DSA-5555-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openvpn | 2.6.7-1.1 | openSUSE-SU-2024:13429-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openvpn | 2.6.7-r0 | — |
| Alpine v3.23 | openvpn | 2.6.7-r0 | — |
| Alpine v3.22 | openvpn | 2.6.7-r0 | — |
| Alpine v3.21 | openvpn | 2.6.7-r0 | — |
| Alpine v3.20 | openvpn | 2.6.7-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | openvpn | 2.6.7-r0 | — |
| Alpine v3.18 | openvpn | 2.6.7-r0 | — |
Advisories 6
- DSA-5555-1 openvpn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:13429-1 openvpn-2.6.7-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2872 OpenVPN: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 22, 2024
- NCSC-2024-0362 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Sep 10, 2024
- ICSA-24-256-10 Siemens SINEMA CISA ICS & IT advisories · Sep 10, 2024
- SSA-417159 SSA-417159: Multiple Vulnerabilities in SINEMA Remote Connect Client Before V3.2 SP2 Siemens ProductCERT · Sep 10, 2024