Read the docs
TI-2020-11229 Aliases CVE-2020-14361GHSA-4ghg-p426-jc5w

Integer underflow in xorg-x11-server

Priority LOW 35CWE-191Published · 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: 16 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-191 and the CVSS impact.

Summary

A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Why it matters now

EPSS 0.00589 48th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 16 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
—xorg-x11-serverbefore xorg-x11-server 1.20.9—No fix listedCNA
  • xorg-x11-server Vendor— Affected before xorg-x11-server 1.20.9 Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*before 1.20.9Vulnerablex.org
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*14.04VulnerableCanonical
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
  • cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* Versions before 1.20.9 Vulnerable ·x.org
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat

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-2020:4953 Released 2020-11-05 · Red Hat rating Important
    xorg-x11-server security update
    • Red Hat Enterprise Linux Desktop (v. 6) xorg-x11-server-1.17.4-18.el6_10, xorg-x11-server-Xephyr-1.17.4-18.el6_10, xorg-x11-server-Xorg-1.17.4-18.el6_10 +1
    • Red Hat Enterprise Linux Desktop Optional (v. 6) xorg-x11-server-Xdmx-1.17.4-18.el6_10, xorg-x11-server-Xnest-1.17.4-18.el6_10, xorg-x11-server-Xvfb-1.17.4-18.el6_10 +2
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) xorg-x11-server-1.17.4-18.el6_10, xorg-x11-server-Xdmx-1.17.4-18.el6_10, xorg-x11-server-Xephyr-1.17.4-18.el6_10 +6
    • Red Hat Enterprise Linux Server (v. 6) xorg-x11-server-1.17.4-18.el6_10, xorg-x11-server-Xephyr-1.17.4-18.el6_10, xorg-x11-server-Xorg-1.17.4-18.el6_10 +1
    • Red Hat Enterprise Linux Server Optional (v. 6) xorg-x11-server-Xdmx-1.17.4-18.el6_10, xorg-x11-server-Xnest-1.17.4-18.el6_10, xorg-x11-server-Xvfb-1.17.4-18.el6_10 +3
    • Red Hat Enterprise Linux Workstation (v. 6) xorg-x11-server-1.17.4-18.el6_10, xorg-x11-server-Xephyr-1.17.4-18.el6_10, xorg-x11-server-Xorg-1.17.4-18.el6_10 +1
    • Red Hat Enterprise Linux Workstation Optional (v. 6) xorg-x11-server-Xdmx-1.17.4-18.el6_10, xorg-x11-server-Xnest-1.17.4-18.el6_10, xorg-x11-server-Xvfb-1.17.4-18.el6_10 +2
  • RHSA-2020:4910 Released 2020-11-04 · Red Hat rating Important
    xorg-x11-server security update
    • Red Hat Enterprise Linux Client (v. 7) xorg-x11-server-1.20.4-12.el7_9, xorg-x11-server-Xephyr-1.20.4-12.el7_9, xorg-x11-server-Xorg-1.20.4-12.el7_9 +1
    • Red Hat Enterprise Linux Client Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-12.el7_9, xorg-x11-server-Xnest-1.20.4-12.el7_9, xorg-x11-server-Xvfb-1.20.4-12.el7_9 +3
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) xorg-x11-server-1.20.4-12.el7_9, xorg-x11-server-Xdmx-1.20.4-12.el7_9, xorg-x11-server-Xephyr-1.20.4-12.el7_9 +7
    • Red Hat Enterprise Linux Server (v. 7) xorg-x11-server-1.20.4-12.el7_9, xorg-x11-server-Xephyr-1.20.4-12.el7_9, xorg-x11-server-Xorg-1.20.4-12.el7_9 +1
    • Red Hat Enterprise Linux Server Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-12.el7_9, xorg-x11-server-Xnest-1.20.4-12.el7_9, xorg-x11-server-Xvfb-1.20.4-12.el7_9 +4
    • Red Hat Enterprise Linux Workstation (v. 7) xorg-x11-server-1.20.4-12.el7_9, xorg-x11-server-Xephyr-1.20.4-12.el7_9, xorg-x11-server-Xorg-1.20.4-12.el7_9 +1
    • Red Hat Enterprise Linux Workstation Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-12.el7_9, xorg-x11-server-Xnest-1.20.4-12.el7_9, xorg-x11-server-Xvfb-1.20.4-12.el7_9 +3

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-2020:4910
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:4910
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2020:4910
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2020:4953
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2020:4953
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2020:4953
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2020:4953
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4910
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2020:4953
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:4910
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2020:4953
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4910
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2020:4953
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:4910
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-14361
  2. 2026-10-03 Alias added: GHSA-4ghg-p426-jc5w

References

Patch 1

Advisory 4

Sources

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