CVE-2020-28049An 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…
- 6.3MediumCVSS base score
- 0.42%Exploitation in 30 daysEPSS · top 64% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By mitre
- 2 days later
· 2 days later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium6.3 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Modified | 3.1 | Medium6.3 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.42% · top 64% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.
Affected products
n/a
- affected n/a
References
References8
- https://github.com/sddm/sddm/releases (opens in a new tab)x_transferred
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049 (opens in a new tab)x_transferred
- https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog (opens in a new tab)x_transferred
- DSA-4783 (opens in a new tab)vendor-advisoryx_transferred
- [debian-lts-announce] 20201106 [SECURITY] [DLA 2436-1] sddm security update (opens in a new tab)mailing-listx_transferred
- openSUSE-SU-2020:1870 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2021-7066b95c99 (opens in a new tab)vendor-advisoryx_transferred
- GLSA-202402-02 (opens in a new tab)vendor-advisoryx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2020-20539 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2020-28049)Record last updated .