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TI-2021-02434 Aliases CVE-2021-3472GHSA-cmmq-26gr-w7rc

Integer underflow in xorg-x11-server

Priority LOW 36CWE-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: 7 fixed, 2 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 in versions before 1.20.11. An integer underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Why it matters now

EPSS 0.0105 64th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 7 fixed, 2 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-serverxorg-x11-server 1.20.11—No fix listedCNA
  • xorg-x11-server Vendor— Affected xorg-x11-server 1.20.11 Fixed in — No fix listed CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*before 1.20.11Vulnerablex.org
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*32VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
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 1.20.11 Vulnerable ·x.org
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • 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 1 advisory

  • RHSA-2021:2033 Released 2021-05-19 · Red Hat rating Important
    xorg-x11-server security update
    • Red Hat Enterprise Linux Client (v. 7) xorg-x11-server-1.20.4-16.el7_9, xorg-x11-server-Xephyr-1.20.4-16.el7_9, xorg-x11-server-Xorg-1.20.4-16.el7_9 +1
    • Red Hat Enterprise Linux Client Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-16.el7_9, xorg-x11-server-Xnest-1.20.4-16.el7_9, xorg-x11-server-Xvfb-1.20.4-16.el7_9 +3
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) xorg-x11-server-1.20.4-16.el7_9, xorg-x11-server-Xdmx-1.20.4-16.el7_9, xorg-x11-server-Xephyr-1.20.4-16.el7_9 +7
    • Red Hat Enterprise Linux Server (v. 7) xorg-x11-server-1.20.4-16.el7_9, xorg-x11-server-Xephyr-1.20.4-16.el7_9, xorg-x11-server-Xorg-1.20.4-16.el7_9 +1
    • Red Hat Enterprise Linux Server Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-16.el7_9, xorg-x11-server-Xnest-1.20.4-16.el7_9, xorg-x11-server-Xvfb-1.20.4-16.el7_9 +4
    • Red Hat Enterprise Linux Workstation (v. 7) xorg-x11-server-1.20.4-16.el7_9, xorg-x11-server-Xephyr-1.20.4-16.el7_9, xorg-x11-server-Xorg-1.20.4-16.el7_9 +1
    • Red Hat Enterprise Linux Workstation Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-16.el7_9, xorg-x11-server-Xnest-1.20.4-16.el7_9, xorg-x11-server-Xvfb-1.20.4-16.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 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:2033
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2021:2033
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2021:2033
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:2033
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:2033
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:2033
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2021:2033
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3472
  2. 2026-10-03 Alias added: GHSA-cmmq-26gr-w7rc

References

Patch 5

Advisory 9

Sources

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