{"id":"ALPINE-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":"2026-11-03T06:32:47.572889963Z","published":"2021-06-10T16:15:08.227Z","upstream":["CVE-2021-34557"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-34557"}],"affected":[{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}},{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}},{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}},{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}},{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}},{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}},{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}},{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}},{"package":{"name":"xscreensaver","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/xscreensaver?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.02-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-34557.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}