VDB
CVE-2021-34557
CVE-2021-34557
PUBLISHED
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.
EPSS 0.17% · 38.4th percentile
Risk Scores
EPSS Score
0.17%
38.4th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:22.04:LTS | xscreensaver | 0, * |
| Ubuntu:20.04:LTS | xscreensaver | 5.42+dfsg1-1ubuntu1, 0 |
| Ubuntu:18.04:LTS | xscreensaver | 0, 5.36-1ubuntu1 |
| Ubuntu:16.04:LTS | xscreensaver | 5.34-2ubuntu1, 5.34-1ubuntu1, 5.30-1ubuntu1 |
Timeline
- Jun 10, 2021 CVE Published
- Jun 11, 2021 EPSS Score
- Aug 12, 2021 EPSS Score
- Oct 11, 2021 EPSS Score
- Dec 11, 2021 EPSS Score
- Feb 4, 2022 EPSS Score
- Feb 10, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- Apr 11, 2022 EPSS Score
- Jun 11, 2022 EPSS Score
- Aug 12, 2022 EPSS Score
- Oct 12, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-34557 third-party-advisory
- https://www.openwall.com/lists/oss-security/2021/06/05/1 third-party-advisory
- https://www.openwall.com/lists/oss-security/2021/06/05/2 third-party-advisory
- https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch third-party-advisory
- https://github.com/QubesOS/qubes-issues/issues/6595 third-party-advisory
- https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-34557 third-party-advisory