Is CVE-2021-31979 in the CISA KEV catalog?

Yes. CVE-2021-31979 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03.

What is the CVSS severity of CVE-2021-31979?

CVE-2021-31979 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-31979?

CVE-2021-31979 has an EPSS score of 2.61% (83th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-31979

HIGHCISA KEVEPSS 83th pctl

7.8

CVSS v3

NVD

Description

Windows Kernel Elevation of Privilege Vulnerability

CWE-119Buffer Overflow

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

2.61%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Windows Kernel Privilege Escalation Vulnerability

Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.

Apply updates per vendor instructions.

Remediation due: 2021-11-17

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-29.