CVE-2023-21674

Name: CVE-2023-21674
Creator: NVD / NIST
Published: 2023-01-10T22:15:16.307+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10Actively ExploitedEPSS 41.54%

Last modified Jun 17, 2026

CVE-2023-21674 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability. CISA has confirmed active exploitation in the wild. EPSS estimates a 41.54% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

41.54%

98.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jan 31, 2023.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
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	All versions
Microsoft	Windows Server 2012	r2
Microsoft	Windows Server 2016	< 10.0.14393.5648
Microsoft	Windows Server 2019	< 10.0.17763.3887
Microsoft	Windows Server 2022	< 10.0.20348.1487

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674Patch, Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21674US Government Resource

Timeline

Published: Jan 10, 2023
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-21674?

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

How severe is CVE-2023-21674?

CVE-2023-21674 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 41.54% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2023-21674?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-21674?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST