{"id":"UBUNTU-CVE-2020-27837","details":"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.","modified":"2026-04-22T12:38:56.384747Z","published":"2020-12-28T19:15:00Z","upstream":["CVE-2020-27837"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-27837"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-27837"}],"affected":[{"package":{"name":"gdm3","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/gdm3@3.36.3-0ubuntu0.20.04.4?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.34.1-1ubuntu1","3.36.3-0ubuntu0.20.04.1","3.36.3-0ubuntu0.20.04.2","3.36.3-0ubuntu0.20.04.3","3.36.3-0ubuntu0.20.04.4"],"ecosystem_specific":{"binaries":[{"binary_name":"gdm3","binary_version":"3.36.3-0ubuntu0.20.04.4"},{"binary_name":"gir1.2-gdm-1.0","binary_version":"3.36.3-0ubuntu0.20.04.4"},{"binary_name":"libgdm1","binary_version":"3.36.3-0ubuntu0.20.04.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27837.json"}},{"package":{"name":"gdm3","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/gdm3@42.0-1ubuntu7.22.04.4?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["41~rc-0ubuntu2","41.0-3ubuntu1","41.0-3ubuntu2","41.3-1ubuntu1","41.3-1ubuntu2","41.3-1ubuntu3","42.0-1ubuntu1","42.0-1ubuntu2","42.0-1ubuntu4","42.0-1ubuntu6","42.0-1ubuntu7","42.0-1ubuntu7.22.04.1","42.0-1ubuntu7.22.04.2","42.0-1ubuntu7.22.04.3","42.0-1ubuntu7.22.04.4"],"ecosystem_specific":{"binaries":[{"binary_name":"gdm3","binary_version":"42.0-1ubuntu7.22.04.4"},{"binary_name":"gir1.2-gdm-1.0","binary_version":"42.0-1ubuntu7.22.04.4"},{"binary_name":"libgdm1","binary_version":"42.0-1ubuntu7.22.04.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27837.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"low"}]}