CVE-2017-13721: Debian Linux

Medium severity, CVSS 4.7. EPSS: 0.4% chance of exploitation in the next 30 days.

In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension enabled can cause aborts of the X server or replace shared memory segments of other X clients in the same session.

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.