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TI-2020-11231 Aliases CVE-2020-14363GHSA-qmwg-hw9q-xg39

Integer overflow in X11 Project libX11

Priority LOW 35CWE-190Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 12 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.00562 46th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 3 advisoriesRed Hat: 12 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
The X11 ProjectlibX111.6.12—No fix listedCNA
  • libX11 VendorThe X11 Project Affected 1.6.12 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*before 1.6.12Vulnerablex.org
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
  • cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:* Versions before 1.6.12 Vulnerable ·x.org
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject

Remediation

Red Hat 3 advisories

  • RHSA-2021:1804 Released 2021-05-18 · Red Hat rating Moderate
    userspace graphics, xorg-x11, and mesa security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) libinput-devel-1.16.3-1.el8, libwacom-devel-1.6-2.el8, mesa-libOSMesa-devel-20.3.3-2.el8 +3
    • Red Hat Enterprise Linux AppStream (v. 8) egl-wayland-1.1.5-3.el8, libX11-1.6.8-4.el8, libX11-common-1.6.8-4.el8 +38
  • RHSA-2020:4946 Released 2020-11-05 · Red Hat rating Important
    libX11 security update
    • Red Hat Enterprise Linux Desktop (v. 6) libX11-1.6.4-4.el6_10, libX11-common-1.6.4-4.el6_10
    • Red Hat Enterprise Linux Desktop Optional (v. 6) libX11-devel-1.6.4-4.el6_10
    • Red Hat Enterprise Linux HPC Node (v. 6) libX11-1.6.4-4.el6_10, libX11-common-1.6.4-4.el6_10
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) libX11-devel-1.6.4-4.el6_10
    • Red Hat Enterprise Linux Server (v. 6) libX11-1.6.4-4.el6_10, libX11-1.6.4-4.el6_10.ppc, libX11-common-1.6.4-4.el6_10 +2
    • Red Hat Enterprise Linux Workstation (v. 6) libX11-1.6.4-4.el6_10, libX11-common-1.6.4-4.el6_10, libX11-devel-1.6.4-4.el6_10
  • RHSA-2020:4908 Released 2020-11-04 · Red Hat rating Important
    libX11 security update
    • Red Hat Enterprise Linux Client (v. 7) libX11-1.6.7-3.el7_9, libX11-common-1.6.7-3.el7_9, libX11-devel-1.6.7-3.el7_9
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) libX11-devel-1.6.7-3.el7_9
    • Red Hat Enterprise Linux Server (v. 7) libX11-1.6.7-3.el7_9, libX11-1.6.7-3.el7_9.ppc, libX11-common-1.6.7-3.el7_9 +2
    • Red Hat Enterprise Linux Workstation (v. 7) libX11-1.6.7-3.el7_9, libX11-common-1.6.7-3.el7_9, libX11-devel-1.6.7-3.el7_9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:1804
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:1804
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:4908
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2020:4908
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2020:4946
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2020:4946
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2020:4946
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2020:4946
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2020:4946
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4908
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2020:4946
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4908

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-14363
  2. 2026-10-03 Alias added: GHSA-qmwg-hw9q-xg39

References

Exploit 1

Advisory 5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences