CVE catalog

CVE-2020-14363

libx11: CVE-2020-14363

Severity: High · CVSS 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: Aug 25, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.57% · Oct 27, 2026

An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability.

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	libx11	sid	`2:1.8.14-1`	fixed
Debian	libx11	forky	`2:1.8.13-1`	fixed
Debian	libx11	trixie	`2:1.8.12-1`	fixed
Debian	libx11	bookworm	`2:1.8.4-2+deb12u2`	fixed
Debian	libx11	bookworm-security	`2:1.8.4-2+deb12u2`	fixed
Alpine	libx11	3.10	`1.6.12-r0`	fixed
Alpine	libx11	3.11	`1.6.12-r0`	fixed
Alpine	libx11	3.12	`1.6.12-r0`	fixed
Alpine	libx11	3.13	`1.6.12-r0`	fixed
Alpine	libx11	3.14	`1.6.12-r0`	fixed
Alpine	libx11	3.15	`1.6.12-r0`	fixed
Alpine	libx11	3.16	`1.6.12-r0`	fixed
Alpine	libx11	3.17	`1.6.12-r0`	fixed
Alpine	libx11	3.18	`1.6.12-r0`	fixed
Alpine	libx11	3.19	`1.6.12-r0`	fixed
Alpine	libx11	3.20	`1.6.12-r0`	fixed
Alpine	libx11	3.21	`1.6.12-r0`	fixed
Alpine	libx11	3.22	`1.6.12-r0`	fixed
Alpine	libx11	3.23	`1.6.12-r0`	fixed
Alpine	libx11	3.24	`1.6.12-r0`	fixed
Alpine	libx11	3.9	`1.6.12-r0`	fixed
Ubuntu	libx11	pro	`2:1.6.1-1ubuntu1`	vulnerable
Ubuntu	libx11	pro	`2:1.6.1-1ubuntu2`	vulnerable
Ubuntu	libx11	pro	`2:1.6.2-1ubuntu1`	vulnerable
Ubuntu	libx11	pro	`2:1.6.2-1ubuntu2`	vulnerable
Ubuntu	libx11	pro	`2:1.6.2-1ubuntu2.1`	vulnerable
Ubuntu	libx11	pro	`2:1.6.2-1ubuntu2.1+esm1`	fixed
Ubuntu	libx11	16.04	`2:1.6.3-1ubuntu2`	vulnerable
Ubuntu	libx11	16.04	`2:1.6.3-1ubuntu2.1`	vulnerable
Ubuntu	libx11	16.04	`2:1.6.3-1ubuntu2.2`	fixed
Ubuntu	libx11	18.04	`2:1.6.4-3`	vulnerable
Ubuntu	libx11	18.04	`2:1.6.4-3ubuntu0.1`	vulnerable
Ubuntu	libx11	18.04	`2:1.6.4-3ubuntu0.2`	vulnerable
Ubuntu	libx11	18.04	`2:1.6.4-3ubuntu0.3`	fixed
Ubuntu	libx11	20.04	`2:1.6.8-1`	vulnerable
Ubuntu	libx11	20.04	`2:1.6.9-2`	vulnerable
Ubuntu	libx11	20.04	`2:1.6.9-2ubuntu1`	vulnerable
Ubuntu	libx11	20.04	`2:1.6.9-2ubuntu1.1`	fixed
Suse	libX11	linux enterprise high performance computing 15-espos	`1.6.5-3.12.1`	fixed
Suse	libX11	linux enterprise high performance computing 15-ltss	`1.6.5-3.12.1`	fixed
Suse	libX11	linux enterprise server 15-ltss	`1.6.5-3.12.1`	fixed
Suse	libX11	linux enterprise server for sap applications 15	`1.6.5-3.12.1`	fixed
Opensuse	libX11	leap 15.2	`1.6.5-lp152.5.9.1`	fixed
Suse	libX11	hpe helion openstack 8	`1.6.2-12.15.1`	fixed
Suse	libX11	openstack cloud 7	`1.6.2-12.15.1`	fixed
Suse	libX11	openstack cloud 8	`1.6.2-12.15.1`	fixed
Suse	libX11	openstack cloud 9	`1.6.2-12.15.1`	fixed
Suse	libX11	openstack cloud crowbar 8	`1.6.2-12.15.1`	fixed
Suse	libX11	openstack cloud crowbar 9	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server for sap applications 12 sp2	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server for sap applications 12 sp3	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server for sap applications 12 sp4	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server 12 sp2-ltss	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server 12 sp2-bcl	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server 12 sp3-ltss	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server 12 sp3-bcl	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server 12 sp4-ltss	`1.6.2-12.15.1`	fixed
Suse	libX11	enterprise storage 5	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise software development kit 12 sp5	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server 12 sp5	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise server for sap applications 12 sp5	`1.6.2-12.15.1`	fixed
Suse	libX11	linux enterprise module for basesystem 15 sp1	`1.6.5-3.12.1`	fixed
Suse	libX11	linux enterprise module for basesystem 15 sp2	`1.6.5-3.12.1`	fixed
Opensuse	libX11	leap 15.1	`1.6.5-lp151.4.9.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libx11	source	sid	`2:1.6.12-1`	not yet assigned	Not reported	[969008]
Debian	libx11	source	forky	`2:1.6.12-1`	not yet assigned	Not reported	[969008]
Debian	libx11	source	trixie	`2:1.6.12-1`	not yet assigned	Not reported	[969008]
Debian	libx11	source	bookworm	`2:1.6.12-1`	not yet assigned	Not reported	[969008]
Alpine	libx11	apk	3.10	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.11	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.12	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.13	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.14	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.15	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.16	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.17	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.18	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.19	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.20	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.21	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.22	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.23	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.24	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Alpine	libx11	apk	3.9	`1.6.12-r0`	Not reported	ALPINE-CVE-2020-14363	Not reported
Ubuntu	libx11	deb	pro	`2:1.6.2-1ubuntu2.1+esm1`	Not reported	UBUNTU-CVE-2020-14363	Not reported
Ubuntu	libx11	deb	16.04	`2:1.6.3-1ubuntu2.2`	Not reported	UBUNTU-CVE-2020-14363	Not reported
Ubuntu	libx11	deb	18.04	`2:1.6.4-3ubuntu0.3`	Not reported	UBUNTU-CVE-2020-14363	Not reported
Ubuntu	libx11	deb	20.04	`2:1.6.9-2ubuntu1.1`	Not reported	UBUNTU-CVE-2020-14363	Not reported
Suse	libX11	rpm	linux enterprise high performance computing 15-espos	`1.6.5-3.12.1`	Not reported	SUSE-SU-2020:2474-2	Not reported
Suse	libX11	rpm	linux enterprise high performance computing 15-ltss	`1.6.5-3.12.1`	Not reported	SUSE-SU-2020:2474-2	Not reported
Suse	libX11	rpm	linux enterprise server 15-ltss	`1.6.5-3.12.1`	Not reported	SUSE-SU-2020:2474-2	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 15	`1.6.5-3.12.1`	Not reported	SUSE-SU-2020:2474-2	Not reported
Opensuse	libX11	rpm	leap 15.2	`1.6.5-lp152.5.9.1`	Not reported	OPENSUSE-SU-2020:1370-1	Not reported
Suse	libX11	rpm	hpe helion openstack 8	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	openstack cloud 7	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	openstack cloud 8	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	openstack cloud 9	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	openstack cloud crowbar 8	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	openstack cloud crowbar 9	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 12 sp2	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 12 sp3	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 12 sp4	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise server 12 sp2-ltss	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise server 12 sp2-bcl	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise server 12 sp3-ltss	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise server 12 sp3-bcl	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise server 12 sp4-ltss	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	enterprise storage 5	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-2	Not reported
Suse	libX11	rpm	linux enterprise software development kit 12 sp5	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-1	Not reported
Suse	libX11	rpm	linux enterprise server 12 sp5	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-1	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 12 sp5	`1.6.2-12.15.1`	Not reported	SUSE-SU-2020:2475-1	Not reported
Suse	libX11	rpm	linux enterprise module for basesystem 15 sp1	`1.6.5-3.12.1`	Not reported	SUSE-SU-2020:2474-1	Not reported
Suse	libX11	rpm	linux enterprise module for basesystem 15 sp2	`1.6.5-3.12.1`	Not reported	SUSE-SU-2020:2474-1	Not reported
Opensuse	libX11	rpm	leap 15.1	`1.6.5-lp151.4.9.1`	Not reported	OPENSUSE-SU-2020:1368-1	Not reported

[Debian bug #969008]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libx11-6]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-data]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · all · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-dev]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-doc]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · all · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-xcb1]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-xcb-dev]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12

[Debian 13 (Trixie)]

[libx11-6]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
[libx11-data]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · all · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · all · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
[libx11-dev]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
[libx11-doc]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · all · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · all · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
[libx11-xcb1]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
[libx11-xcb-dev]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Fixed · Fixed: 2:1.6.12-1
  dsa · libx11 · debian · 13

Observed: Oct 23, 2026, 5:47:57 PM UTC

References

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