{"id":"CVE-2021-34557","details":"XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in update_screen_layout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.","modified":"2026-04-16T04:35:19.156042550Z","published":"2021-06-10T16:15:08.227Z","related":["SUSE-SU-2022:2641-1","SUSE-SU-2022:2642-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/06/11/1"},{"type":"REPORT","url":"https://github.com/QubesOS/qubes-issues/issues/6595"},{"type":"FIX","url":"https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch"},{"type":"EVIDENCE","url":"https://www.openwall.com/lists/oss-security/2021/06/05/1"},{"type":"EVIDENCE","url":"http://www.openwall.com/lists/oss-security/2021/07/06/2"},{"type":"EVIDENCE","url":"https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"5.45"}]},{"events":[{"introduced":"0"},{"last_affected":"33"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-34557.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}