CVE catalog
CVE-2021-34557
xscreensaver: CVE-2021-34557
- Severity
- Medium · CVSS 6.4
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.48% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | xscreensaver | sid | 6.09+dfsg1-2 | fixed |
| Debian | xscreensaver | forky | 6.09+dfsg1-2 | fixed |
| Debian | xscreensaver | trixie | 6.09+dfsg1-1 | fixed |
| Debian | xscreensaver | bookworm | 6.06+dfsg1-3+deb12u1 | fixed |
| Suse | xscreensaver | linux enterprise module for basesystem 15 sp3 | 5.44-150000.5.6.1 | fixed |
| Opensuse | xscreensaver | leap 15.3 | 5.44-150000.5.6.1 | fixed |
| Suse | xscreensaver | linux enterprise server 12 sp5 | 5.22-8.3.1 | fixed |
| Suse | xscreensaver | linux enterprise server for sap applications 12 sp5 | 5.22-8.3.1 | fixed |
| Ubuntu | xscreensaver | 16.04 | 5.30-1ubuntu1 | vulnerable |
| Ubuntu | xscreensaver | 16.04 | 5.34-1ubuntu1 | vulnerable |
| Ubuntu | xscreensaver | 16.04 | 5.34-2ubuntu1 | vulnerable |
| Ubuntu | xscreensaver | 18.04 | 5.36-1ubuntu1 | vulnerable |
| Ubuntu | xscreensaver | 20.04 | 5.42+dfsg1-1ubuntu1 | vulnerable |
| Ubuntu | xscreensaver | 22.04 | 5.45+dfsg1-2ubuntu1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | xscreensaver | source | sid | 5.45+dfsg1-2 | not yet assigned | Not reported | [989508] |
| Debian | xscreensaver | source | forky | 5.45+dfsg1-2 | not yet assigned | Not reported | [989508] |
| Debian | xscreensaver | source | trixie | 5.45+dfsg1-2 | not yet assigned | Not reported | [989508] |
| Debian | xscreensaver | source | bookworm | 5.45+dfsg1-2 | not yet assigned | Not reported | [989508] |
| Suse | xscreensaver | rpm | linux enterprise module for basesystem 15 sp3 | 5.44-150000.5.6.1 | Not reported | SUSE-SU-2022:2641-1 | Not reported |
| Opensuse | xscreensaver | rpm | leap 15.3 | 5.44-150000.5.6.1 | Not reported | SUSE-SU-2022:2641-1 | Not reported |
| Suse | xscreensaver | rpm | linux enterprise server 12 sp5 | 5.22-8.3.1 | Not reported | SUSE-SU-2022:2642-1 | Not reported |
| Suse | xscreensaver | rpm | linux enterprise server for sap applications 12 sp5 | 5.22-8.3.1 | Not reported | SUSE-SU-2022:2642-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [xscreensaver]Fixed
Details (4)
6.06+dfsg1-3+deb12u1· amd64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.06+dfsg1-3+deb12u1· arm64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
- [xscreensaver-data]Fixed
Source package: [xscreensaver]
Details (4)
6.06+dfsg1-3+deb12u1· amd64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.06+dfsg1-3+deb12u1· arm64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
- [xscreensaver-data-extra]Fixed
Source package: [xscreensaver]
Details (4)
6.06+dfsg1-3+deb12u1· amd64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.06+dfsg1-3+deb12u1· arm64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
- [xscreensaver-gl]Fixed
Source package: [xscreensaver]
Details (4)
6.06+dfsg1-3+deb12u1· amd64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.06+dfsg1-3+deb12u1· arm64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
- [xscreensaver-gl-extra]Fixed
Source package: [xscreensaver]
Details (4)
6.06+dfsg1-3+deb12u1· amd64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.06+dfsg1-3+deb12u1· arm64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
Source package: [xscreensaver]
Details (4)
6.06+dfsg1-3+deb12u1· amd64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.06+dfsg1-3+deb12u1· arm64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
Source package: [xscreensaver]
Details (4)
6.06+dfsg1-3+deb12u1· amd64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.06+dfsg1-3+deb12u1· arm64 · bookwormFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
6.08+dfsg1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · bookworm; dsa · xscreensaver · debian · 12
[Debian 13 (Trixie)]
- [xscreensaver]Fixed
Details (2)
6.09+dfsg1-1· amd64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
6.09+dfsg1-1· arm64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
- [xscreensaver-data]Fixed
Source package: [xscreensaver]
Details (2)
6.09+dfsg1-1· amd64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
6.09+dfsg1-1· arm64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
- [xscreensaver-data-extra]Fixed
Source package: [xscreensaver]
Details (2)
6.09+dfsg1-1· amd64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
6.09+dfsg1-1· arm64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
- [xscreensaver-gl]Fixed
Source package: [xscreensaver]
Details (2)
6.09+dfsg1-1· amd64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
6.09+dfsg1-1· arm64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
- [xscreensaver-gl-extra]Fixed
Source package: [xscreensaver]
Details (2)
6.09+dfsg1-1· amd64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
6.09+dfsg1-1· arm64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
Source package: [xscreensaver]
Details (2)
6.09+dfsg1-1· amd64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
6.09+dfsg1-1· arm64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
Source package: [xscreensaver]
Details (2)
6.09+dfsg1-1· amd64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
6.09+dfsg1-1· arm64 · trixieFixed · Fixed:
5.45+dfsg1-2dsa · xscreensaver · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2022_2641-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-34557]
- [https://osv.dev/vulnerability/SUSE-SU-2022:2641-1]
- [https://osv.dev/vulnerability/SUSE-SU-2022:2642-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-34557]
- [https://security-tracker.debian.org/tracker/CVE-2021-34557]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]