{"id":"CVE-2020-27837","aliases":["DEBIAN-CVE-2020-27837","EUVD-2020-20336","GHSA-xpm4-75c2-wrgc","OESA-2022-1811","OESA-2022-1812","UBUNTU-CVE-2020-27837","openSUSE-SU-2024:11547-1"],"status":"published","title":"A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of...","description":"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.","severity":{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00228,"percentile":0.13697,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-362"],"published":"2020-12-28T18:34:04Z","modified":"2026-10-26T12:01:48Z","fixes":[{"ecosystem":"Debian:12","package":"gdm3","fixed_in":["3.38.2.1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"gdm3","fixed_in":["3.38.2.1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"gdm3","fixed_in":["3.38.2.1-1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP1","package":"gdm","fixed_in":["3.38.2.1-1.oe1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP3","package":"gdm","fixed_in":["3.38.2.1-1.oe1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"gdm3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.38.2.1-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"gdm3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.38.2.1-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"gdm3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.38.2.1-1"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP1","package":"gdm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.38.2.1-1.oe1"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP3","package":"gdm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.38.2.1-1.oe1"}]}]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"gdm3","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"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"gdm3","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"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"gdm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"41.0-1.1"}]}],"bundled":2}],"products":[{"vendor":"gnome","product":"gnome_display_manager"},{"vendor":"the gnome projectr","product":"gdm"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1906812","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27837","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xpm4-75c2-wrgc"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-27837","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1811","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1812","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-27837","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-27837","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2020-16125","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-27837","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2020-27837","description":"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.","status":"published","published":"2020-12-28T18:34:04Z","modified":"2024-08-04T16:25:43.322Z","cwes":["CWE-362"],"updated_at":"2026-11-02T14:35:53.236501Z"}],"euvd":[{"id":"EUVD-2020-20336","description":"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.","status":"published","published":"2020-12-28T18:34:04Z","modified":"2024-08-04T16:25:43Z","updated_at":"2026-11-03T03:07:11.950168Z"}],"ghsa":[{"id":"GHSA-xpm4-75c2-wrgc","title":"A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of...","description":"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.","status":"published","published":"2022-05-24T17:37:25Z","modified":"2023-01-29T05:05:51Z","cwes":["CWE-362"],"updated_at":"2026-11-02T14:45:53.268312Z"}],"nvd":[{"id":"CVE-2020-27837","description":"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.","status":"published","published":"2020-12-28T19:15:13.063Z","modified":"2026-06-17T03:09:42.783Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.4,"vector":"AV:L/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:06:28.340168Z"}],"osv":[{"id":"CVE-2020-27837","description":"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.","status":"published","published":"2020-12-28T19:15:13.063Z","modified":"2026-10-24T10:30:57.282539784Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"DEBIAN-CVE-2020-27837","description":"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.","status":"published","published":"2020-12-28T19:15:13.063Z","modified":"2026-10-26T12:01:48.956206106Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:33.729655Z"},{"id":"OESA-2022-1811","title":"gdm security update","description":"The GNOME Display Manager is a system service that is responsible for providing graphical log-ins and managing local and remote displays, and if the session doesn\u0026apos;t provide a display server, GDM will start the display server. It also provides initiate functionality for user-switching, so multiple users can be logged in at the same time.\r\n\r\nSecurity Fix(es):\r\n\r\nA 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.(CVE-2020-27837)","status":"published","published":"2022-08-05T11:05:05Z","modified":"2026-08-18T01:17:07.298488486Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"OESA-2022-1812","title":"gdm security update","description":"The GNOME Display Manager is a system service that is responsible for providing graphical log-ins and managing local and remote displays, and if the session doesn\u0026apos;t provide a display server, GDM will start the display server. It also provides initiate functionality for user-switching, so multiple users can be logged in at the same time.\r\n\r\nSecurity Fix(es):\r\n\r\nA 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.(CVE-2020-27837)","status":"published","published":"2022-08-05T11:05:05Z","modified":"2026-08-18T01:16:12.818841391Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"UBUNTU-CVE-2020-27837","description":"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.","status":"published","published":"2020-12-28T19:15:00Z","modified":"2026-04-22T12:38:56.384747Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:24.541803Z"},{"id":"openSUSE-SU-2024:11547-1","title":"gdm-41.0-1.1 on GA media","description":"These are all security issues fixed in the gdm-41.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:55:21.630187Z","updated_at":"2026-11-02T16:58:35.195147Z"}]}}