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CVE-2023-21674

HighPublished

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

Published: Jan 10, 2023
Updated: Oct 21, 2025
Assigning CNA: microsoft
Evidence observed: Jan 10, 2023

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

41.8%

Moderate · next 30 days

Percentile: 98.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

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

Sources

CVE-2023-21674PoC
Proof-of-concept exploit for CVE-2023-21674, a Windows ALPC vulnerability enabling browser sandbox escape and SYSTEM privilege escalation via kernel memory manipulation.

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