Description
In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to denial of service or potentially code execution.
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 | 1.7.0+dfsg-7 | — |
| Debian 13 | tigervnc | 1.7.0+dfsg-7 | — |
| Debian 12 | tigervnc | 1.7.0+dfsg-7 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | fltk +3 | 1.3.4-1.el7 | RHSA-2017:2000 |
| RHEL 7 | tigervnc +6 | 1.8.0-1.el7 | RHSA-2017:2000 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | tigervnc | 1.6.0-18.11.1 | SUSE-SU-2017:1094-1 |
| SLES 12 SP1 | tigervnc | 1.4.3-24.1 | SUSE-SU-2017:1093-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | tigervnc | 1.6.0-18.11.1 | SUSE-SU-2017:1094-1 |
| SLES for SAP 12 SP1 | tigervnc | 1.4.3-24.1 | SUSE-SU-2017:1093-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | fltk +3 | 1.3.4-1.el7 | ELSA-2017-2000 |
| Oracle Linux 7 | tigervnc +6 | 1.8.0-1.el7 | ELSA-2017-2000 |
Advisories 5
- RHSA-2017:2000 Red Hat Security Advisory: tigervnc and fltk security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- SUSE-SU-2017:1093-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1094-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0660 tigervnc: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 31, 2025
- ELSA-2017-2000 Moderate: tigervnc and fltk security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 7, 2017
References
- RHSA-2017:2000 vendor-advisory
- 97305 vdb-entry
- https://github.com/TigerVNC/tigervnc/pull/438
- GLSA-201801-13 vendor-advisory