CVE-2021-34557
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-34557
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-34557.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-34557
- Downstream
- Related
- Published
- 2021-06-10T16:15:08Z
- Modified
- 2025-08-09T19:01:27Z
- Severity
-
- 4.6 (Medium) CVSS_V3 - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in updatescreenlayout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.
- References
-
- http://www.openwall.com/lists/oss-security/2021/06/11/1
- http://www.openwall.com/lists/oss-security/2021/07/06/2
- https://github.com/QubesOS/qubes-issues/issues/6595
- https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt
- https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch
- https://www.openwall.com/lists/oss-security/2021/06/05/1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/