ClosedPatched

Microsoft Windows: Advanced Local Procedure Call (ALPC) Privilege Escalation (CVE-2023-21674)

Microsoft Windows

Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation. Added to CISA KEV on 2023-01-10.

Why this severity: CVSS 8.8 (NVD), actively exploited (CISA KEV)

Started: Jan 10, 2023
Closed: Jan 10, 2023
CVE: CVE-2023-21674

Follow this incident

Updated Jan 10, 2023

Affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

Fixed in

See vendor advisory linked in sources

Timeline1

Jan 10, 2023
CISA added CVE-2023-21674 to the KEV catalog (due 2023-01-31).

Advisories3

Notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).

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