Description
OpenConnect through 8.08 mishandles negative return values from X509_check_ function calls, which might assist attackers in performing man-in-the-middle attacks.
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 | openconnect | No fix yet | — |
| Debian 13 | openconnect | No fix yet | — |
| Debian 12 | openconnect | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | oath-toolkit | 2.6.2-150000.3.5.1 | SUSE-SU-2024:0317-1 |
| SLES 15 SP5 | openconnect | 9.12-150400.15.3.1 | SUSE-SU-2024:0317-1 |
| SLES 15 SP5 | stoken | 0.81-150400.13.2.1 | SUSE-SU-2024:0317-1 |
| SLES 15 SP1 | openconnect | 7.08-6.6.1 | SUSE-SU-2020:1337-1 |
| SLES 12 SP5 | openconnect | 7.08-3.9.1 | SUSE-SU-2020:1264-1 |
| SLES 12 SP4 | openconnect | 7.08-3.9.1 | SUSE-SU-2020:1264-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openconnect | 8.10-2.6 | openSUSE-SU-2024:11114-1 |
| openSUSE Leap 15.5 | oath-toolkit | 2.6.2-150000.3.5.1 | SUSE-SU-2024:0317-1 |
| openSUSE Leap 15.5 | openconnect | 9.12-150400.15.3.1 | SUSE-SU-2024:0317-1 |
| openSUSE Leap 15.5 | stoken | 0.81-150400.13.2.1 | SUSE-SU-2024:0317-1 |
| openSUSE Leap 15.1 | openconnect | 7.08-lp151.6.6.1 | openSUSE-SU-2020:0694-1 |
Advisories 5
- SUSE-SU-2024:0317-1 Security update for openconnect SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0694-1 Security update for openconnect SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1337-1 Security update for openconnect SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1264-1 Security update for openconnect SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11114-1 libopenconnect5-8.10-2.6 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://gitlab.com/openconnect/openconnect/-/merge_requests/96
- openSUSE-SU-2020:0694 vendor-advisory
- GLSA-202006-15 vendor-advisory