Description
An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage() in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.
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-1.1 | — |
| Debian 14 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 13 | libvncserver | 0.9.11+dfsg-1.1 | — |
| Debian 13 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 12 | libvncserver | 0.9.11+dfsg-1.1 | — |
| Debian 12 | tightvnc | 1:1.3.9-9.1 | — |
| Debian 12 | vino | 3.22.0-6 | — |
| Debian 9 | libvncserver | 0.9.11+dfsg-1+deb9u1 | DSA-4221-1 |
| Debian 8 | italc | 1:2.0.2+dfsg1-2+deb8u1 | DLA-1979-1 |
| Debian 8 | libvncserver | 0.9.9+dfsg2-6.1+deb8u3 | DSA-4221-1 |
| Debian 8 | tightvnc | 1.3.9-6.5+deb8u1 | DLA-2045-1 |
| Debian 8 | vino | 3.14.0-2+deb8u1 | DLA-2014-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | libvncserver | 0.9.9+dfsg-1+deb7u3 | DLA-1332-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tightvnc | No fix yet | — |
| Ubuntu 26.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 25.10 | tightvnc | No fix yet | — |
| Ubuntu 24.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 22.04 LTS | tightvnc | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 20.04 LTS | vino | 3.22.0-5ubuntu2.1 | USN-4573-1 |
| Ubuntu 18.04 LTS | italc | 1:3.0.3+dfsg1-3ubuntu0.1 | USN-4547-1 |
| Ubuntu 18.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 18.04 LTS | vino | 3.22.0-3ubuntu1.1 | USN-4573-1 |
| Ubuntu 16.04 LTS | italc | 1:2.0.2+dfsg1-4ubuntu0.1 | USN-4587-1 |
| Ubuntu 16.04 LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.2 | USN-3618-1 |
| Ubuntu 16.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 16.04 LTS | vino | 3.8.1-0ubuntu9.3 | USN-4573-1 |
| Ubuntu 14.04 LTS | libvncserver | 0.9.9+dfsg-1ubuntu1.3 | USN-3618-1 |
| Ubuntu Pro 14.04 LTS | tightvnc | 1.3.9-6.5+deb8u1build0.14.04.1~esm1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | libvncserver +1 | 0.9.9-12.el7_5 | RHSA-2018:1055 |
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 11 SP4 | LibVNCServer | 0.9.1-160.3.1 | SUSE-SU-2018:0875-1 |
Show 3 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 11 SP4 | LibVNCServer | 0.9.1-160.3.1 | SUSE-SU-2018:0875-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.23 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.22 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.21 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.20 | libvncserver | 0.9.11-r2 | — |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.18 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.17 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.16 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.15 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.14 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.13 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.12 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.11 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.10 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.9 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.8 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.7 | libvncserver | 0.9.11-r2 | — |
| Alpine v3.6 | libvncserver | 0.9.11-r1 | — |
| Alpine v3.5 | libvncserver | 0.9.11-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libvncserver +1 | 0.9.9-12.amzn2 | ALAS2-2018-1012 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | libvncserver +1 | 0.9.9-12.el7_5 | ELSA-2018-1055 |
Advisories 14
- RHSA-2018:1055 Red Hat Security Advisory: libvncserver security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4547-1 italc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4587-1 italc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4573-1 vino vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-3618-1 libvncserver vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-2014-1 vino - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4221-1 libvncserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2045-1 tightvnc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1979-1 italc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1332-1 libvncserver - 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-2018:0875-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2018-1012 Moderate: libvncserver security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 10, 2018
- ELSA-2018-1055 Moderate: libvncserver security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 17, 2018
References
- DSA-4221 vendor-advisory
- USN-3618-1 vendor-advisory
- https://github.com/LibVNC/libvncserver/issues/218
- [debian-lts-announce] 20180330 [SECURITY] [DLA 1332-1] libvncserver security update mailing-list
- 103107 vdb-entry
- http://www.openwall.com/lists/oss-security/2018/02/18/1
- RHSA-2018:1055 vendor-advisory
- GLSA-201908-05 vendor-advisory
- [debian-lts-announce] 20191030 [SECURITY] [DLA 1979-1] italc security update mailing-list
- [debian-lts-announce] 20191129 [SECURITY] [DLA 2014-1] vino security update mailing-list
- [debian-lts-announce] 20191221 [SECURITY] [DLA 2045-1] tightvnc security update mailing-list
- USN-4547-1 vendor-advisory
- USN-4573-1 vendor-advisory
- USN-4587-1 vendor-advisory