CVE-2023-21674

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

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

CVSS Score

8.8

High

EPSS — Exploit Probability

42%

Riskier than 99% of all CVEs · checked 2026-09-08

Exploitation

Confirmed in the wild

KEV since 2023-01-10

Remediation

Patch available

Federal deadline 2023-01-31

CISA required action

Apply updates per vendor instructions. Deadline for federal agencies: 2023-01-31.

1 article across 1 outlet · first covered Sep 8, 2026 · latest Sep 8, 2026

Coverage timeline