CVE-2021-3472: Debian Linux

High severity, CVSS 7.8. EPSS: 1.1% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only
• X.org X Server: before 1.20.11 (fixed in 1.20.11)

Published 2021-04-26. Last modified 2026-06-17.