CVE-2017-13723: Debian Linux

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

In X.Org Server (aka xserver and xorg-server) before 1.19.4, a local attacker authenticated to the X server could overflow a global buffer, causing crashes of the X server or potentially other problems by injecting large or malformed XKB related atoms and accessing them via xkbcomp.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• X.org X Server: up to and including 1.19.3

Published 2017-10-10. Last modified 2026-06-17.