Security readout for executives and security teams
SDDM, a Linux display manager, briefly allowed a local unprivileged user to connect to the X server without proper authentication. That could expose display contents, keystrokes, or clipboard data. The issue is local-only and timing-dependent, but it matters on shared Linux workstations, kiosks, labs, and hosts where untrusted users can log in. Exposure is most likely on Linux systems using SDDM with X11, especially distributions that shipped SDDM before 0.19.0 or unpatched downstream packages. Risk is higher where local shell or desktop access is available to multiple users. Treat this as a moderate-priority workstation and shared-system issue. It is not a remote internet-facing flaw, but it can expose sensitive screen, keystroke, or clipboard data to a local user. Patch through normal Linux security update channels, prioritizing shared environments. Mitigation focus: Upgrade SDDM to 0.19.0 or a vendor-patched package.; Apply relevant Debian, openSUSE, Fedora, or Gentoo security updates.; Check your Linux distribution advisory for exact fixed package versions..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-362: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-28049 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N15.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/sddm/sddm/releasesCVE reference
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049CVE reference
- https://github.com/sddm/sddm/blob/v0.19.0/ChangeLogCVE reference
- DSA-4783CVE reference · vendor-advisory
- [debian-lts-announce] 20201106 [SECURITY] [DLA 2436-1] sddm security updateCVE reference · mailing-list
- FEDORA-2021-7066b95c99CVE reference · vendor-advisory
- GLSA-202402-02CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.