Description
TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System (DoS). This attack appear to be exploitable via network connectivity.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Kaspersky | TightVNC | 1.3.10 | — |
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 | No fix yet | — |
| Debian 14 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 13 | libvncserver | No fix yet | — |
| Debian 13 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 12 | libvncserver | No fix yet | — |
| Debian 12 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 8 | tightvnc | 1.3.9-6.5+deb8u1 | DLA-2045-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ssvnc +3 | No fix yet | — |
| Ubuntu 26.04 LTS | ssvnc +3 | No fix yet | — |
| Ubuntu 25.10 | ssvnc +3 | No fix yet | — |
| Ubuntu 24.04 LTS | ssvnc +3 | No fix yet | — |
| Ubuntu 22.04 LTS | ssvnc +3 | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libvncserver | 0.9.12+dfsg-9ubuntu0.1 | USN-4407-1 |
| Ubuntu 20.04 LTS | ssvnc +3 | No fix yet | — |
| Ubuntu 18.04 LTS | libvncserver | 0.9.11+dfsg-1ubuntu1.2 | USN-4407-1 |
| Ubuntu 18.04 LTS | ssvnc +2 | No fix yet | — |
| Ubuntu 16.04 LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.4 | USN-4407-1 |
| Ubuntu 16.04 LTS | ssvnc +2 | No fix yet | — |
| Ubuntu 14.04 LTS | x11vnc | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tightvnc | 1.3.9-6.5+deb8u1build0.14.04.1~esm1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | tightvnc | 1.3.9-81.15.3.1 | SUSE-SU-2019:14235-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Linux Enterprise Point of Sale 11 SP3 | tightvnc | 1.3.9-81.15.3.1 | SUSE-SU-2019:14235-1 |
Advisories 5
- USN-4407-1 libvncserver vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-2045-1 tightvnc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:14235-1 Security update for tightvnc SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-20-343-08 Siemens Products using TightVNC (Update A) CISA ICS & IT advisories · May 6, 2025
- SSA-478893 SSA-478893: TightVNC Vulnerabilities in Industrial Products (Revoked) Siemens ProductCERT · May 11, 2021
References
- [oss-security] 20181210 libvnc and tightvnc vulnerabilities mailing-list
- [debian-lts-announce] 20191221 [SECURITY] [DLA 2045-1] tightvnc security update mailing-list
- USN-4407-1 vendor-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-478893.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-20-343-08