CVE-2020-27837: Gnome Display Manager

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of session shutdown makes it possible to bypass the lock screen for a user that has autologin enabled, accessing their session without authentication. This is similar to CVE-2017-12164, but requires more difficult conditions to exploit.

Affected products

• Gnome Gnome Display Manager: before 3.38.2.1 (fixed in 3.38.2.1)

Published 2020-12-28. Last modified 2026-06-17.