Read the docs
TI-2020-11217 Aliases CVE-2020-14346GHSA-483f-26r4-2fvr

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 xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Why it matters now

EPSS 0.00604 49th 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-2020-14346
  2. 2026-10-03 Alias added: GHSA-483f-26r4-2fvr
  3. 2026-10-28 EPSS moved to the 50th–90th percentile
  4. 2026-11-07 EPSS moved to the below the 50th percentile

References

Patch 1

Advisory 4

Sources

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