CVE-2021-34557
4.6
MEDIUM
CVSS 3.1
EPSS 0.17%
Description
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.
How to fix CVE-2021-34557
To remediate CVE-2021-34557, upgrade the affected package to a fixed version below.
- Debian/xscreensaver—upgrade to 5.45+dfsg1-2 or later
Is CVE-2021-34557 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 5.45+dfsg1-2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.6 | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |