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CVE-2023-21674

High 8.8 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply updates per vendor instructions.

Description

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

Metrics

CVSS 3.1
8.8 (HIGH) Score source: CNA CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS — exploit probability
34% (percentile: 98) as of 2 November 2026
CWE
CWE-416

Affected products

microsoft: windows 10 1507; microsoft: windows 10 1607; microsoft: windows 10 1809; microsoft: windows 10 20h2; microsoft: windows 10 21h2; microsoft: windows 10 22h2; microsoft: windows 11 21h2; microsoft: windows 11 22h2; microsoft: windows rt 8.1; microsoft: windows server 2012; microsoft: windows server 2016; microsoft: windows server 2019; microsoft: windows server 2022

References