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Vulnerability Intelligence

CVE-2023-21674

HighExploitedPublic exploit

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

Published Jan 11, 2023 · Updated Oct 21, 2025

Key Facts

Patch immediately
  • CVE-2023-21674 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Windows 10 1507 (Microsoft), Windows 10 1607 (Microsoft), Windows 10 1809 (Microsoft) and 22 more products.
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 10, 2023. Public exploit code is available.
  • EPSS estimates a 41% probability of exploitation in the next 30 days.
  • Fixed versions are available, including Windows 10 1507 10.0.10240.19685, Windows 10 1607 10.0.14393.5648, Windows 10 1809 10.0.17763.3887.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.8

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

EPSS (30-day exploit likelihood)

41%

Higher than 98.6% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2023-21674 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVJan 10, 2023Jan 31, 2023Not reported
Industry KEV feedJan 10, 2023Jan 31, 2023Not reported
CIRCL KEVJan 10, 2023Jan 31, 2023Not reported
ENISA EUVDJan 10, 2023n/aNot reported

Required action: Apply updates per vendor instructions.

Affected Products

29 affected entries in total
ProductAffected versionsFixed in
Windows 10 1507MicrosoftSee advisory10.0.10240.19685
Windows 10 1607MicrosoftSee advisory10.0.14393.5648
Windows 10 1809MicrosoftSee advisory10.0.17763.3887
Windows 10 20h2MicrosoftSee advisory10.0.19042.2486
Windows 10 21h2MicrosoftSee advisory10.0.19044.2486
20 more affected products in the full CVE brief

Patched Releases

Windows 10 1507

10.0.10240.19685

Windows 10 1607

10.0.14393.5648

Windows 10 1809

10.0.17763.3887

Windows 10 20h2

10.0.19042.2486

Windows 10 21h2

10.0.19044.2486

Windows 10 22h2

10.0.19045.2486

Windows 11 21h2

10.0.22000.1455

Windows 11 22h2

10.0.22621.1105

Windows Server 2016

10.0.14393.5648

Windows Server 2019

10.0.17763.3887

Windows Server 2022

10.0.20348.1487

Windows 10 Version 1507

10.0.10240.19685

Windows 10 Version 1607

10.0.14393.5648

Windows 10 Version 1809

10.0.17763.3887

Windows 10 Version 20H2

10.0.19042.2486

Windows 10 Version 21H2

10.0.19044.2486

Windows 10 Version 22H2

10.0.19045.2486

Windows 11 version 21H2

10.0.22000.1455

Windows 11 version 22H2

10.0.22621.1105

Windows 8.1

6.3.9600.20778

Windows Server 2012 R2

6.3.9600.20778

Windows Server 2012 R2 (Server Core installation)

6.3.9600.20778

Windows Server 2016 (Server Core installation)

10.0.14393.5648

Windows Server 2019 (Server Core installation)

10.0.17763.3887

Timeline

  1. Added to CISA KEV

    Jan 10, 2023

  2. Added to Industry KEV feed

    Jan 10, 2023

  3. Added to CIRCL KEV

    Jan 10, 2023

  4. Added to ENISA EUVD

    Jan 10, 2023

  5. Publicly disclosed

    Jan 11, 2023

  6. Last updated

    Oct 21, 2025

Weakness Type

  • CWE-416 Use After Free

References

9 more references in the full CVE brief

FAQ

Common Questions.

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