CVE catalog

CVE-2018-20020

libvncserver: CVE-2018-20020

Severity: High · CVSS 8.8CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: Dec 19, 2018, 4:29:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 8.62% · Oct 25, 2026

LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution

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	ssvnc	sid	`1.0.29-7`	fixed
Debian	ssvnc	forky	`1.0.29-7`	fixed
Debian	ssvnc	trixie	`1.0.29-6.1`	fixed
Debian	ssvnc	bookworm	`1.0.29-6`	fixed
Debian	veyon	sid	`4.9.7+repack1-1.1`	fixed
Debian	veyon	trixie	`4.9.5+repack1-2`	fixed
Debian	veyon	bookworm	`4.7.5+repack1-1`	fixed
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	ssvnc	16.04	`1.0.29-2build1`	vulnerable
Ubuntu	ssvnc	16.04	`1.0.29-2+deb8u1build0.16.04.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ssvnc	source	sid	`1.0.29-5`	not yet assigned	Not reported	[945827]
Debian	ssvnc	source	forky	`1.0.29-5`	not yet assigned	Not reported	[945827]
Debian	ssvnc	source	trixie	`1.0.29-5`	not yet assigned	Not reported	[945827]
Debian	ssvnc	source	bookworm	`1.0.29-5`	not yet assigned	Not reported	[945827]
Debian	veyon	source	sid	`4.1.4+repack1-1`	not yet assigned	Not reported	Not reported
Debian	veyon	source	trixie	`4.1.4+repack1-1`	not yet assigned	Not reported	Not reported
Debian	veyon	source	bookworm	`4.1.4+repack1-1`	not yet assigned	Not reported	Not reported
Debian	libvncserver	source	sid	`0.9.11+dfsg-1.2`	not yet assigned	Not reported	[916941]
Debian	libvncserver	source	forky	`0.9.11+dfsg-1.2`	not yet assigned	Not reported	[916941]
Debian	libvncserver	source	trixie	`0.9.11+dfsg-1.2`	not yet assigned	Not reported	[916941]
Debian	libvncserver	source	bookworm	`0.9.11+dfsg-1.2`	not yet assigned	Not reported	[916941]
Ubuntu	ssvnc	deb	16.04	`1.0.29-2+deb8u1build0.16.04.1`	Not reported	USN-4547-2	Not reported

[Debian bug #945827][Debian bug #916941]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libveyon-core]Fixed
Source package: [veyon]
Details (2)
- 4.7.5+repack1-1 · amd64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
- 4.7.5+repack1-1 · arm64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
[libvncclient1]Fixed
Source package: [libvncserver]
Details (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
[libvncserver1]Fixed
Source package: [libvncserver]
Details (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
[libvncserver-dev]Fixed
Source package: [libvncserver]
Details (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
[ssvnc]Fixed
Source package: [ssvnc]
Details (2)
- 1.0.29-6+b1 · amd64 · bookworm
  Fixed · Fixed: 1.0.29-5
  dsa · ssvnc · debian · bookworm; dsa · ssvnc · debian · 12
- 1.0.29-6+b1 · arm64 · bookworm
  Fixed · Fixed: 1.0.29-5
  dsa · ssvnc · debian · bookworm; dsa · ssvnc · debian · 12
[veyon-configurator]Fixed
Source package: [veyon]
Details (2)
- 4.7.5+repack1-1 · amd64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
- 4.7.5+repack1-1 · arm64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
[veyon-master]Fixed
Source package: [veyon]
Details (2)
- 4.7.5+repack1-1 · amd64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
- 4.7.5+repack1-1 · arm64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
[veyon-plugins]Fixed
Source package: [veyon]
Details (2)
- 4.7.5+repack1-1 · amd64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
- 4.7.5+repack1-1 · arm64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
[veyon-service]Fixed
Source package: [veyon]
Details (2)
- 4.7.5+repack1-1 · amd64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12
- 4.7.5+repack1-1 · arm64 · bookworm
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · bookworm; dsa · veyon · debian · 12

[Debian 13 (Trixie)]

[libveyon-core]Fixed
Source package: [veyon]
Details (2)
- 4.9.5+repack1-2 · amd64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
- 4.9.5+repack1-2 · arm64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
[libvncclient1]Fixed
Source package: [libvncserver]
Details (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · 13
[libvncserver1]Fixed
Source package: [libvncserver]
Details (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · 13
[libvncserver-dev]Fixed
Source package: [libvncserver]
Details (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Fixed · Fixed: 0.9.11+dfsg-1.2
  dsa · libvncserver · debian · 13
[ssvnc]Fixed
Details (2)
- 1.0.29-6.1 · amd64 · trixie
  Fixed · Fixed: 1.0.29-5
  dsa · ssvnc · debian · 13
- 1.0.29-6.1 · arm64 · trixie
  Fixed · Fixed: 1.0.29-5
  dsa · ssvnc · debian · 13
[veyon-configurator]Fixed
Source package: [veyon]
Details (2)
- 4.9.5+repack1-2 · amd64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
- 4.9.5+repack1-2 · arm64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
[veyon-master]Fixed
Source package: [veyon]
Details (2)
- 4.9.5+repack1-2 · amd64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
- 4.9.5+repack1-2 · arm64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
[veyon-plugins]Fixed
Source package: [veyon]
Details (2)
- 4.9.5+repack1-2 · amd64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
- 4.9.5+repack1-2 · arm64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
[veyon-service]Fixed
Source package: [veyon]
Details (2)
- 4.9.5+repack1-2 · amd64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13
- 4.9.5+repack1-2 · arm64 · trixie
  Fixed · Fixed: 4.1.4+repack1-1
  dsa · veyon · debian · 13

Observed: Oct 23, 2026, 5:35:55 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]