Security readout for executives and security teams
Plain-English summary
CVE-2021-31952 is a Windows kernel-mode driver flaw that could let a low-privileged local attacker gain higher privileges on affected Windows systems. It is serious because successful exploitation can compromise confidentiality, integrity, and availability, but the bundle does not show remote unauthenticated exploitation or active exploitation.
Executive priority
Prioritize remediation in normal high-severity patch cycles, with faster handling for shared or privileged-access systems. This is not shown as actively exploited in the bundle, but it can materially worsen any initial compromise.
Technical view
The vulnerability is a local elevation-of-privilege issue in Microsoft Windows Kernel-Mode Driver. CVSS 3.1 is 7.8 with local access, low complexity, low privileges, no user interaction, unchanged scope, and high CIA impact. Official remediation is available according to the CVSS remediation level.
Likely exposure
Exposure is limited to affected Windows 10 and Windows Server builds listed in the bundle, especially unpatched 1809, 1909, 2004, 20H2, 21H1, Server 2019, and Server Core installations.
Exploitation context
The source bundle marks KEV as false and CVSS exploit maturity as unproven. Treat this mainly as a post-compromise privilege escalation risk unless vendor or threat intelligence sources indicate otherwise.
Researcher notes
The provided data does not include root-cause details, vulnerable driver names, exploit primitives, or proof-of-concept status. Analysis should stay anchored to Microsoft advisory metadata, CVSS, affected CPEs, and KEV absence.
Mitigation direction
- Apply Microsoft security updates for CVE-2021-31952 on affected Windows systems.
- Use current cumulative updates where Microsoft superseded older fixes.
- Prioritize shared workstations, VDI, terminal servers, and high-value servers.
- Limit local logon rights and remove unnecessary low-privileged accounts.
- If patching is delayed, isolate high-risk hosts and increase endpoint monitoring.
Validation and detection
- Inventory Windows builds matching the affected versions in the bundle.
- Confirm installed patch level against Microsoft’s CVE-2021-31952 advisory.
- Check vulnerability scanner results for this CVE after patching.
- Review endpoint alerts for suspicious local privilege escalation behavior.
- Verify Server Core and legacy Windows 10 deployments are not missed.
Public sources used
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.
Privilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-31952 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:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
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:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31952CVE reference · x_refsource_MISC
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.