Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2023-21674

CVE-2023-21674HIGH

Microsoft Windows 10 Version 1809 — Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  C  H  H  H    8.8   .4099   98.6   YES

AFFECTED
  Product                                         Versions        Fixed
  Windows 10 Version 1809                         10.0.17763.0 –  —
  Windows 10 Version 1809                         10.0.0 –        —
  Windows Server 2019                             10.0.17763.0 –  —
  Windows Server 2019 (Server Core installation)  10.0.17763.0 –  —
  Windows Server 2022                             10.0.20348.0 –  —
  Windows 10 Version 20H2                         10.0.0 –        —
  Windows 11 version 21H2                         10.0.0 –        —
  Windows 10 Version 21H2                         10.0.19043.0 –  —
  Windows 11 version 22H2                         10.0.22621.0 –  —
  Windows 10 Version 22H2                         10.0.19045.0 –  —
  + 7 more

TIMELINE
  Dec 13  Reserved by microsoft
  Jan 10  Added to CISA KEV, remediation due 2023-01-31
  Jan 10  Published (CNA: microsoft)

CWE-416 · CNA: microsoft · CVSS v3.1 · 2 references · KEV due January 31, 2023

Description

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

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 13, 2022	Reserved	Reserved by microsoft
January 10, 2023	KEV ADDED	Added to CISA KEV, remediation due 2023-01-31
January 10, 2023	Published	Published (CNA: microsoft)

Affected

Affected products and packages — 17 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 10 Version 1809	—	10.0.17763.0	—
Microsoft	Windows 10 Version 1809	—	10.0.0	—
Microsoft	Windows Server 2019	—	10.0.17763.0	—
Microsoft	Windows Server 2019 (Server Core installation)	—	10.0.17763.0	—
Microsoft	Windows Server 2022	—	10.0.20348.0	—
Microsoft	Windows 10 Version 20H2	—	10.0.0	—
Microsoft	Windows 11 version 21H2	—	10.0.0	—
Microsoft	Windows 10 Version 21H2	—	10.0.19043.0	—
Microsoft	Windows 11 version 22H2	—	10.0.22621.0	—
Microsoft	Windows 10 Version 22H2	—	10.0.19045.0	—
Microsoft	Windows 10 Version 1507	—	10.0.10240.0	—
Microsoft	Windows 10 Version 1607	—	10.0.14393.0	—
Microsoft	Windows Server 2016	—	10.0.14393.0	—
Microsoft	Windows Server 2016 (Server Core installation)	—	10.0.14393.0	—
Microsoft	Windows 8.1	—	6.3.0	—
Microsoft	Windows Server 2012 R2	—	6.3.9600.0	—
Microsoft	Windows Server 2012 R2 (Server Core installation)	—	6.3.9600.0	—

Weaknesses

CWE-416

References (2)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674 [vendor-advisory]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21674 [government-resource]

Authoritative record: CVE-2023-21674 at cve.org

Vendors: microsoft

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2023-21674 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, October 7, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.