Is CVE-2021-31199 in the CISA KEV catalog?

Yes. CVE-2021-31199 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03.

What is the CVSS severity of CVE-2021-31199?

CVE-2021-31199 has a CVSS v3 base score of 5.2 (MEDIUM).

What is the EPSS score for CVE-2021-31199?

CVE-2021-31199 has an EPSS score of 2.95% (85th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-31199

MEDIUMCISA KEVEPSS 85th pctl

5.2

CVSS v3

NVD

Description

Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

2.95%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability

Microsoft Enhanced Cryptographic Provider 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 2025-10-30.