Description
In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception.
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 | tigervnc | 1.10.1+dfsg-9 | — |
| Debian 13 | tigervnc | 1.10.1+dfsg-9 | — |
| Debian 12 | tigervnc | 1.10.1+dfsg-9 | — |
| Debian 9 | tigervnc | 1.7.0+dfsg-7+deb9u2 | DLA-2396-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | tigervnc | 1.10.1+dfsg-3ubuntu0.1+esm2 | USN-5965-1 |
| Ubuntu Pro 18.04 LTS | tigervnc | 1.7.0+dfsg-8ubuntu2+esm1 | USN-9088-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | tigervnc +6 | 1.11.0-6.el8 | RHSA-2021:1783 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | tigervnc | 1.11.0-6.el8 | RLSA-2021:1783 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | tigervnc | 1.9.0-19.9.1 | SUSE-SU-2020:2880-1 |
| SLES 15 SP1 | tigervnc | 1.9.0-19.9.1 | SUSE-SU-2020:2880-1 |
| SLES 15 | tigervnc | 1.8.0-13.14.1 | SUSE-SU-2020:2882-1 |
| SLES 12 SP5 | tigervnc | 1.6.0-22.17.1 | SUSE-SU-2020:2881-1 |
| SLES 12 SP4 | tigervnc | 1.6.0-22.17.1 | SUSE-SU-2020:2881-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
| SLES 12 SP2 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
| SLES for SAP 15 | tigervnc | 1.8.0-13.14.1 | SUSE-SU-2020:2882-1 |
| SLES for SAP 12 SP5 | tigervnc | 1.6.0-22.17.1 | SUSE-SU-2020:2881-1 |
| SLES for SAP 12 SP4 | tigervnc | 1.6.0-22.17.1 | SUSE-SU-2020:2881-1 |
| SLES for SAP 12 SP3 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
| SLES for SAP 12 SP2 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
| SLE HPC 15 | tigervnc | 1.8.0-13.14.1 | SUSE-SU-2020:2882-1 |
| SUSE OpenStack Cloud Crowbar 9 | tigervnc | 1.6.0-22.17.1 | SUSE-SU-2020:2881-1 |
| SUSE OpenStack Cloud Crowbar 8 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
| SUSE OpenStack Cloud 9 | tigervnc | 1.6.0-22.17.1 | SUSE-SU-2020:2881-1 |
| SUSE OpenStack Cloud 8 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
| SUSE OpenStack Cloud 7 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
| SUSE HPE Helion OpenStack 8 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
| SUSE Enterprise Storage 5 | tigervnc | 1.6.0-27.1 | SUSE-SU-2020:2898-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tigervnc | 1.10.1-17.1 | openSUSE-SU-2024:10591-1 |
| openSUSE Leap 15.2 | tigervnc | 1.9.0-lp152.7.3.1 | openSUSE-SU-2020:1666-1 |
| openSUSE Leap 15.1 | tigervnc | 1.9.0-lp151.4.9.1 | openSUSE-SU-2020:1841-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | tigervnc +6 | 1.11.0-6.el8 | ELSA-2021-1783 |
Advisories 14
- USN-9088-1 tigervnc vulnerability Ubuntu Security Notices (USN) · Nov 13, 2026
- WID-SEC-2023-0694 tigervnc: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Nov 12, 2026
- USN-5965-1 tigervnc vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-2396-1 tigervnc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:1783 Moderate: tigervnc security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2020:1841-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2898-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10591-1 libXvnc-devel-1.10.1-17.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1666-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2882-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2881-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2880-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2021:1783 Red Hat Security Advisory: tigervnc security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- ELSA-2021-1783 Moderate: tigervnc security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 25, 2021
References
- https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0
- https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e
- https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba
- https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb
- https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b
- https://bugzilla.opensuse.org/show_bug.cgi?id=1176733
- [debian-lts-announce] 20201006 [SECURITY] [DLA 2396-1] tigervnc security update mailing-list
- openSUSE-SU-2020:1666 vendor-advisory
- openSUSE-SU-2020:1841 vendor-advisory