Description
Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area.
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 | 0.9.11+dfsg-1 | — |
| Debian 13 | libvncserver | 0.9.11+dfsg-1 | — |
| Debian 13 | veyon | 4.1.4+repack1-1 | — |
| Debian 12 | libvncserver | 0.9.11+dfsg-1 | — |
| Debian 12 | veyon | 4.1.4+repack1-1 | — |
| Debian 8 | italc | 1:2.0.2+dfsg1-2+deb8u1 | DLA-1979-1 |
| Debian 8 | libvncserver | 0.9.9+dfsg2-6.1+deb8u2 | DSA-3753-1 |
| Debian 7 | libvncserver | 0.9.9+dfsg-1+deb7u2 | DLA-777-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | italc | 1:2.0.2+dfsg1-4ubuntu0.1 | USN-4587-1 |
| Ubuntu 16.04 LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.1 | USN-3171-1 |
| Ubuntu 14.04 LTS | libvncserver | 0.9.9+dfsg-1ubuntu1.2 | USN-3171-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | LibVNCServer | 0.9.9-17.5.1 | SUSE-SU-2018:0830-1 |
| SLES 12 SP2 | LibVNCServer | 0.9.9-17.5.1 | SUSE-SU-2018:0830-1 |
| SLES 12 SP2 | tigervnc | 1.6.0-16.4 | SUSE-SU-2017:0622-1 |
| SLES 12 SP1 | tigervnc | 1.4.3-19.1 | SUSE-SU-2017:0519-1 |
| SLES 11 SP4 | LibVNCServer | 0.9.1-159.1 | SUSE-SU-2017:0104-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | LibVNCServer | 0.9.9-17.5.1 | SUSE-SU-2018:0830-1 |
| SLES for SAP 12 SP2 | LibVNCServer | 0.9.9-17.5.1 | SUSE-SU-2018:0830-1 |
| SLES for SAP 12 SP2 | tigervnc | 1.6.0-16.4 | SUSE-SU-2017:0622-1 |
| SLES for SAP 12 SP1 | tigervnc | 1.4.3-19.1 | SUSE-SU-2017:0519-1 |
| SLES for SAP 11 SP4 | LibVNCServer | 0.9.1-159.1 | SUSE-SU-2017:0104-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.23 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.22 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.21 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.20 | libvncserver | 0.9.11-r0 | — |
Show 18 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.18 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.17 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.16 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.15 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.14 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.13 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.12 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.11 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.10 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.9 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.8 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.7 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.6 | libvncserver | 0.9.11-r0 | — |
| Alpine v3.5 | libvncserver | 0.9.10-r2 | — |
| Alpine v3.4 | libvncserver | 0.9.10-r2 | — |
| Alpine v3.3 | libvncserver | 0.9.10-r2 | — |
| Alpine v3.2 | libvncserver | 0.9.10-r2 | — |
Advisories 9
- USN-4587-1 italc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-3171-1 libvncserver vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-777-1 libvncserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3753-1 libvncserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1979-1 italc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:0830-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:0622-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:0104-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:0519-1 Security update for tigervnc SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 95170 vdb-entry
- https://github.com/LibVNC/libvncserver/pull/137
- DSA-3753 vendor-advisory
- GLSA-201702-24 vendor-advisory
- https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11
- [debian-lts-announce] 20191030 [SECURITY] [DLA 1979-1] italc security update mailing-list
- USN-4587-1 vendor-advisory