Is CVE-2023-21674 in the CISA KEV catalog?

Yes. CVE-2023-21674 is on the CISA Known Exploited Vulnerabilities list, added 2023-01-10.

What is the CVSS severity of CVE-2023-21674?

CVE-2023-21674 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2023-21674?

CVE-2023-21674 has an EPSS score of 41.54% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2023-21674

HIGHCISA KEVEPSS 98th pctl

8.8

CVSS v3

NVD

Description

Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

CWE-416Use After Free

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

41.54%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability

Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.

Apply updates per vendor instructions.

Remediation due: 2023-01-31

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.