CVE catalog
CVE-2018-20749
libvncserver: CVE-2018-20749
- Severity
- Critical · CVSS 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.23% · Oct 25, 2026
LibVNC before 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libvncserver | sid | 0.9.15+dfsg-6 | fixed |
| Debian | libvncserver | forky | 0.9.15+dfsg-6 | fixed |
| Debian | libvncserver | trixie | 0.9.15+dfsg-1+deb13u2 | fixed |
| Debian | libvncserver | bookworm | 0.9.14+dfsg-1+deb12u2 | fixed |
| Ubuntu | libvncserver | 14.04 | 0.9.9+dfsg-1 | vulnerable |
| Ubuntu | libvncserver | 14.04 | 0.9.9+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | libvncserver | 14.04 | 0.9.9+dfsg-1ubuntu1.1 | vulnerable |
| Ubuntu | libvncserver | 14.04 | 0.9.9+dfsg-1ubuntu1.2 | vulnerable |
| Ubuntu | libvncserver | 14.04 | 0.9.9+dfsg-1ubuntu1.3 | vulnerable |
| Ubuntu | libvncserver | 14.04 | 0.9.9+dfsg-1ubuntu1.4 | fixed |
| Ubuntu | italc | 16.04 | 1:2.0.2+dfsg1-3 | vulnerable |
| Ubuntu | italc | 16.04 | 1:2.0.2+dfsg1-4 | vulnerable |
| Ubuntu | italc | 16.04 | 1:2.0.2+dfsg1-4ubuntu0.1 | fixed |
| Ubuntu | libvncserver | 16.04 | 0.9.10+dfsg-3 | vulnerable |
| Ubuntu | libvncserver | 16.04 | 0.9.10+dfsg-3build1 | vulnerable |
| Ubuntu | libvncserver | 16.04 | 0.9.10+dfsg-3ubuntu0.16.04.1 | vulnerable |
| Ubuntu | libvncserver | 16.04 | 0.9.10+dfsg-3ubuntu0.16.04.2 | vulnerable |
| Ubuntu | libvncserver | 16.04 | 0.9.10+dfsg-3ubuntu0.16.04.3 | fixed |
| Ubuntu | italc | 18.04 | 1:3.0.3+dfsg1-1 | vulnerable |
| Ubuntu | italc | 18.04 | 1:3.0.3+dfsg1-2 | vulnerable |
| Ubuntu | italc | 18.04 | 1:3.0.3+dfsg1-2build1 | vulnerable |
| Ubuntu | italc | 18.04 | 1:3.0.3+dfsg1-2ubuntu1 | vulnerable |
| Ubuntu | italc | 18.04 | 1:3.0.3+dfsg1-3 | vulnerable |
| Ubuntu | italc | 18.04 | 1:3.0.3+dfsg1-3ubuntu0.1 | fixed |
| Ubuntu | libvncserver | 18.04 | 0.9.11+dfsg-1 | vulnerable |
| Ubuntu | libvncserver | 18.04 | 0.9.11+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | libvncserver | 18.04 | 0.9.11+dfsg-1ubuntu1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libvncserver | source | sid | 0.9.11+dfsg-1.3 | not yet assigned | Not reported | [920941] |
| Debian | libvncserver | source | forky | 0.9.11+dfsg-1.3 | not yet assigned | Not reported | [920941] |
| Debian | libvncserver | source | trixie | 0.9.11+dfsg-1.3 | not yet assigned | Not reported | [920941] |
| Debian | libvncserver | source | bookworm | 0.9.11+dfsg-1.3 | not yet assigned | Not reported | [920941] |
| Ubuntu | libvncserver | deb | 14.04 | 0.9.9+dfsg-1ubuntu1.4 | Not reported | UBUNTU-CVE-2018-20749 | Not reported |
| Ubuntu | italc | deb | 16.04 | 1:2.0.2+dfsg1-4ubuntu0.1 | Not reported | UBUNTU-CVE-2018-20749 | Not reported |
| Ubuntu | libvncserver | deb | 16.04 | 0.9.10+dfsg-3ubuntu0.16.04.3 | Not reported | UBUNTU-CVE-2018-20749 | Not reported |
| Ubuntu | italc | deb | 18.04 | 1:3.0.3+dfsg1-3ubuntu0.1 | Not reported | UBUNTU-CVE-2018-20749 | Not reported |
| Ubuntu | libvncserver | deb | 18.04 | 0.9.11+dfsg-1ubuntu1.1 | Not reported | UBUNTU-CVE-2018-20749 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libvncclient1]Fixed
Source package: [libvncserver]
Details (2)
0.9.14+dfsg-1+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
0.9.14+dfsg-1+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
- [libvncserver1]Fixed
Source package: [libvncserver]
Details (2)
0.9.14+dfsg-1+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
0.9.14+dfsg-1+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
- [libvncserver-dev]Fixed
Source package: [libvncserver]
Details (2)
0.9.14+dfsg-1+deb12u2· amd64 · bookwormFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
0.9.14+dfsg-1+deb12u2· arm64 · bookwormFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
[Debian 13 (Trixie)]
- [libvncclient1]Fixed
Source package: [libvncserver]
Details (2)
0.9.15+dfsg-1+deb13u2· amd64 · trixieFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · 13
0.9.15+dfsg-1+deb13u2· arm64 · trixieFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · 13
- [libvncserver1]Fixed
Source package: [libvncserver]
Details (2)
0.9.15+dfsg-1+deb13u2· amd64 · trixieFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · 13
0.9.15+dfsg-1+deb13u2· arm64 · trixieFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · 13
- [libvncserver-dev]Fixed
Source package: [libvncserver]
Details (2)
0.9.15+dfsg-1+deb13u2· amd64 · trixieFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · 13
0.9.15+dfsg-1+deb13u2· arm64 · trixieFixed · Fixed:
0.9.11+dfsg-1.3dsa · libvncserver · debian · 13
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-390195.json]
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2019_0283-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2018-20749]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2018-20749]
- [https://security-tracker.debian.org/tracker/CVE-2018-20749]
[CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]