CVE-2020-14363: Fedoraproject Fedora

High severity, CVSS 7.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 33 only
• X.org LIBX11: before 1.6.12 (fixed in 1.6.12)

Published 2020-09-11. Last modified 2026-06-17.