Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2025-21333

CVE-2025-21333HIGH

Microsoft Windows 10 Version 21H2 — Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  H  H    7.8   .0999   95.5   YES

AFFECTED
  Product                                                       Versions        Fixed
  Windows 10 Version 21H2                                       10.0.19044.0 –  —
  Windows 10 Version 22H2                                       10.0.19045.0 –  —
  Windows 11 version 22H2                                       10.0.22621.0 –  —
  Windows 11 version 22H3                                       10.0.22631.0 –  —
  Windows 11 Version 23H2                                       10.0.22631.0 –  —
  Windows 11 Version 24H2                                       10.0.26100.0 –  —
  Windows Server 2022, 23H2 Edition (Server Core installation)  10.0.25398.0 –  —
  Windows Server 2025                                           10.0.26100.0 –  —
  Windows Server 2025 (Server Core installation)                10.0.26100.0 –  —

TIMELINE
  Dec 11  Reserved by microsoft
  Jan 14  Added to CISA KEV, remediation due 2025-02-04
  Jan 14  Published (CNA: microsoft)

CWE-122 · CNA: microsoft · CVSS v3.1 · 5 references · KEV due February 4, 2025

Description

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 11, 2024	Reserved	Reserved by microsoft
January 14, 2025	KEV ADDED	Added to CISA KEV, remediation due 2025-02-04
January 14, 2025	Published	Published (CNA: microsoft)

Affected

Affected products and packages — 9 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 10 Version 21H2	—	10.0.19044.0	—
Microsoft	Windows 10 Version 22H2	—	10.0.19045.0	—
Microsoft	Windows 11 version 22H2	—	10.0.22621.0	—
Microsoft	Windows 11 version 22H3	—	10.0.22631.0	—
Microsoft	Windows 11 Version 23H2	—	10.0.22631.0	—
Microsoft	Windows 11 Version 24H2	—	10.0.26100.0	—
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	—	10.0.25398.0	—
Microsoft	Windows Server 2025	—	10.0.26100.0	—
Microsoft	Windows Server 2025 (Server Core installation)	—	10.0.26100.0	—

Weaknesses

CWE-122

References (5)

Authoritative record: CVE-2025-21333 at cve.org

Vendors: microsoft

Weaknesses: CWE-122

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-21333 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 Sunday, October 4, 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.