CVE-2023-21674

HIGH KEV

Microsoft Windows ALPC - Elevation of Privilege

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2023-21674 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added January 10, 2023. EIP tracks 1 public exploit from researchers including hd3s5aa.

AI-analyzed exploit summary This is a working proof-of-concept exploit for CVE-2023-21674, a Windows ALPC vulnerability leading to a use-after-free (UAF) condition. The exploit demonstrates privilege escalation by manipulating worker factory objects and ALPC ports to trigger the vulnerability.

Description

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

Exploits (1)

nomisec WORKING POC 38 stars
by hd3s5aa · local
https://github.com/hd3s5aa/CVE-2023-21674

This is a working proof-of-concept exploit for CVE-2023-21674, a Windows ALPC vulnerability leading to a use-after-free (UAF) condition. The exploit demonstrates privilege escalation by manipulating worker factory objects and ALPC ports to trigger the vulnerability.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Complex
Reliability
Reliable
Target: Microsoft Windows (ALPC component)
No auth needed
Prerequisites: Windows environment with vulnerable ALPC implementation
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 8.8
EPSS 0.4154
EPSS Percentile 98.5%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable no
Technical Impact total

Details

CISA KEV 2023-01-10
VulnCheck KEV 2023-01-10
InTheWild.io 2023-01-10
ENISA EUVD EUVD-2023-25841
CWE
CWE-416
Status published
Products (13)
microsoft/windows_10_1507 < 10.0.10240.19685
microsoft/windows_10_1607 < 10.0.14393.5648
microsoft/windows_10_1809 < 10.0.17763.3887
microsoft/windows_10_20h2 < 10.0.19042.2486
microsoft/windows_10_21h2 < 10.0.19044.2486
microsoft/windows_10_22h2 < 10.0.19045.2486
microsoft/windows_11_21h2 < 10.0.22000.1455
microsoft/windows_11_22h2 < 10.0.22621.1105
microsoft/windows_rt_8.1
microsoft/windows_server_2012 r2
... and 3 more
Published Jan 10, 2023
KEV Added Jan 10, 2023
Tracked Since Feb 18, 2026