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

HIGH 8.8EXPLOITED (CISA KEV)CVE-2023-21674 · Published 10/01/2023 · updated 17/06/2026

Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 10/01/2023. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

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

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674 · Patch
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2023-21674

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