high7.8Known exploited
CVE-2025-21418
Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability
Exploited in the wild
This vulnerability is on a Known Exploited Vulnerabilities catalogue, added 2025-02-11. Federal due date: 2025-03-04.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Impact
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows 10 1607 | before 10.0.10240.20915 |
| Microsoft | Windows 10 1809 | before 10.0.17763.6893 |
| Microsoft | Windows 10 21h2 | before 10.0.19044.5487 |
| Microsoft | Windows 10 22h2 | before 10.0.19045.5487 |
| Microsoft | Windows 11 22h2 | before 10.0.22621.4890 |
| Microsoft | Windows 11 23h2 | before 10.0.22631.4890 |
| Microsoft | Windows 11 24h2 | before 10.0.26100.3107 |
| Microsoft | Windows Server 2008 | All versions Version r2 |
| Microsoft | Windows Server 2012 | All versions Version r2 |
| Microsoft | Windows Server 2016 | before 10.0.14393.7785 |
| Microsoft | Windows Server 2019 | before 10.0.17763.6893 |
| Microsoft | Windows Server 2022 | before 10.0.20348.3148 |