Security readout for executives and security teams
CVE-2021-3939 is an Ubuntu-specific accountsservice memory bug. A local low-privileged user could reach the flaw through the SetLanguage D-Bus function, potentially causing serious impact to confidentiality, integrity, and availability. Ubuntu has fixed packages for affected releases. Exposure is limited to Ubuntu systems running affected accountsservice package builds: 0.6.55-0ubuntu12~20.04, 0.6.55-0ubuntu13, or 0.6.55-0ubuntu14. Non-Ubuntu builds are not identified as affected in the provided sources. Prioritize normal high-severity remediation. This is not remotely exploitable from the provided evidence, but local privilege context and high potential impact make it important on shared Ubuntu systems. Mitigation focus: Apply Ubuntu USN-5149-1 accountsservice updates from supported repositories.; Upgrade to 0.6.55-0ubuntu12~20.04.5, 0.6.55-0ubuntu13.3, 0.6.55-0ubuntu14.1, or later applicable builds.; Prioritize shared workstations, VDI, lab systems, and servers with local user accounts..
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-590: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-3939 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
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:C/C:H/I:H/A:H1.16Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://ubuntu.com/security/notices/USN-5149-1CVE reference
- https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1950149CVE reference
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.
Free of Memory not on the Heap
Free of Memory not on the Heap represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.