CVE catalog
CVE-2020-28049
sddm: CVE-2020-28049
- Severity
- High · CVSS 7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.42% · Oct 25, 2026
An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.
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 | sddm | sid | 0.21.0+git20260819.da0b64d-1 | fixed |
| Debian | sddm | forky | 0.21.0+git20260819.da0b64d-1 | fixed |
| Debian | sddm | trixie | 0.21.0+git20250502.4fe234b-2 | fixed |
| Debian | sddm | bookworm | 0.19.0-5 | fixed |
| Opensuse | sddm | leap 15.1 | 0.18.0-lp152.5.3.1 | fixed |
| Opensuse | sddm | leap 15.2 | 0.18.0-lp152.5.3.1 | fixed |
| Suse | sddm | package hub 15 sp2 | 0.18.0-bp152.5.3.1 | fixed |
| Ubuntu | sddm | 16.04 | 0.11.0-0ubuntu11 | vulnerable |
| Ubuntu | sddm | 16.04 | 0.11.0-0ubuntu12 | vulnerable |
| Ubuntu | sddm | 16.04 | 0.13.0-1ubuntu1 | vulnerable |
| Ubuntu | sddm | 16.04 | 0.13.0-1ubuntu3 | vulnerable |
| Ubuntu | sddm | 16.04 | 0.13.0-1ubuntu4 | vulnerable |
| Ubuntu | sddm | 16.04 | 0.13.0-1ubuntu5 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.14.0-4ubuntu1 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.14.0-4ubuntu2 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.17.0-1ubuntu1 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.17.0-1ubuntu2 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.17.0-1ubuntu3 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.17.0-1ubuntu4 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.17.0-1ubuntu5 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.17.0-1ubuntu6 | vulnerable |
| Ubuntu | sddm | 18.04 | 0.17.0-1ubuntu7 | vulnerable |
| Ubuntu | sddm | 20.04 | 0.18.0-1ubuntu2 | vulnerable |
| Ubuntu | sddm | 20.04 | 0.18.1-1ubuntu1 | vulnerable |
| Ubuntu | sddm | 20.04 | 0.18.1-1ubuntu2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | sddm | source | sid | 0.19.0-1 | not yet assigned | Not reported | [973748] |
| Debian | sddm | source | forky | 0.19.0-1 | not yet assigned | Not reported | [973748] |
| Debian | sddm | source | trixie | 0.19.0-1 | not yet assigned | Not reported | [973748] |
| Debian | sddm | source | bookworm | 0.19.0-1 | not yet assigned | Not reported | [973748] |
| Opensuse | sddm | rpm | leap 15.1 | 0.18.0-lp152.5.3.1 | Not reported | OPENSUSE-SU-2020:1870-1 | Not reported |
| Opensuse | sddm | rpm | leap 15.2 | 0.18.0-lp152.5.3.1 | Not reported | OPENSUSE-SU-2020:1870-1 | Not reported |
| Suse | sddm | rpm | package hub 15 sp2 | 0.18.0-bp152.5.3.1 | Not reported | OPENSUSE-SU-2020:1899-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [sddm]Fixed
Details (2)
0.19.0-5· amd64 · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
0.19.0-5· arm64 · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
- [sddm-theme-debian-elarun]Fixed
Source package: [sddm]
Details (2)
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
- [sddm-theme-debian-maui]Fixed
Source package: [sddm]
Details (2)
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
- [sddm-theme-elarun]Fixed
Source package: [sddm]
Details (2)
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
- [sddm-theme-maldives]Fixed
Source package: [sddm]
Details (2)
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
- [sddm-theme-maui]Fixed
Source package: [sddm]
Details (2)
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
- [sddm-theme-maya]Fixed
Source package: [sddm]
Details (2)
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
0.19.0-5· all · bookwormFixed · Fixed:
0.19.0-1dsa · sddm · debian · bookworm; dsa · sddm · debian · 12
[Debian 13 (Trixie)]
- [sddm]Fixed
Details (2)
0.21.0+git20250502.4fe234b-2· amd64 · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
0.21.0+git20250502.4fe234b-2· arm64 · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
- [sddm-theme-debian-elarun]Fixed
Source package: [sddm]
Details (2)
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
- [sddm-theme-debian-maui]Fixed
Source package: [sddm]
Details (2)
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
- [sddm-theme-elarun]Fixed
Source package: [sddm]
Details (2)
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
- [sddm-theme-maldives]Fixed
Source package: [sddm]
Details (2)
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
- [sddm-theme-maui]Fixed
Source package: [sddm]
Details (2)
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
- [sddm-theme-maya]Fixed
Source package: [sddm]
Details (2)
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
0.21.0+git20250502.4fe234b-2· all · trixieFixed · Fixed:
0.19.0-1dsa · sddm · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2020_1870-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-28049]
- [https://osv.dev/vulnerability/DLA-2436-1]
- [https://osv.dev/vulnerability/DSA-4783-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-28049]
- [https://osv.dev/vulnerability/openSUSE-SU-2020:1870-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2020:1899-1]
- [https://security-tracker.debian.org/tracker/CVE-2020-28049]
- [https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-28049.json]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]