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-2025-21418
Microsoft Windows 10 Version 1507 — Windows Ancillary Function Driver for WinSock 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 .0157 74.5 YES
AFFECTED
Product Versions Fixed
Windows 10 Version 1507 10.0.10240.0 – —
Windows 10 Version 1607 10.0.14393.0 – —
Windows 10 Version 1809 10.0.17763.0 – —
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 2008 R2 Service Pack 1 6.1.7601.0 – —
+ 15 more
TIMELINE
Dec 11 Reserved by microsoft
Feb 11 Added to CISA KEV, remediation due 2025-03-04
Feb 11 Published (CNA: microsoft)
Description
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| December 11, 2024 | Reserved | Reserved by microsoft |
| February 11, 2025 | KEV ADDED | Added to CISA KEV, remediation due 2025-03-04 |
| February 11, 2025 | Published | Published (CNA: microsoft) |
Affected
Affected products and packages — 25 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | Windows 10 Version 1507 | — | 10.0.10240.0 | — |
| Microsoft | Windows 10 Version 1607 | — | 10.0.14393.0 | — |
| Microsoft | Windows 10 Version 1809 | — | 10.0.17763.0 | — |
| 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 2008 R2 Service Pack 1 | — | 6.1.7601.0 | — |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | — | 6.1.7601.0 | — |
| Microsoft | Windows Server 2008 Service Pack 2 | — | 6.0.6003.0 | — |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | — | 6.0.6003.0 | — |
| Microsoft | Windows Server 2012 | — | 6.2.9200.0 | — |
| Microsoft | Windows Server 2012 (Server Core installation) | — | 6.2.9200.0 | — |
| Microsoft | Windows Server 2012 R2 | — | 6.3.9600.0 | — |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | — | 6.3.9600.0 | — |
| Microsoft | Windows Server 2016 | — | 10.0.14393.0 | — |
| Microsoft | Windows Server 2016 (Server Core installation) | — | 10.0.14393.0 | — |
| 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 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 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-21418 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.
