Description
An issue was discovered in LibVNCServer before 0.9.13. libvncclient/tls_openssl.c has a NULL pointer dereference.
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 | libvncserver | 0.9.13+dfsg-1 | — |
| Debian 13 | libvncserver | 0.9.13+dfsg-1 | — |
| Debian 12 | libvncserver | 0.9.13+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | veyon | No fix yet | — |
| Ubuntu 26.04 LTS | veyon | No fix yet | — |
| Ubuntu 25.10 | veyon | No fix yet | — |
| Ubuntu 24.04 LTS | veyon | No fix yet | — |
| Ubuntu 22.04 LTS | veyon | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libvncserver | 0.9.12+dfsg-9ubuntu0.2 | USN-4434-1 |
| Ubuntu 20.04 LTS | veyon | No fix yet | — |
| Ubuntu 18.04 LTS | libvncserver | 0.9.11+dfsg-1ubuntu1.3 | USN-4434-1 |
| Ubuntu 16.04 LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.5 | USN-4434-1 |
| Ubuntu 14.04 LTS | x11vnc | No fix yet | — |
Advisories 3
- USN-4434-1 libvncserver vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- ICSA-21-350-12 Siemens SIMATIC ITC CISA ICS & IT advisories · May 6, 2025
- SSA-390195 SSA-390195: LibVNC Vulnerabilities in SIMATIC ITC Products Siemens ProductCERT · Dec 14, 2021