Disclosure summary
Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Source-reported weakness categories
CWE-122
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2026-Feb
Open original source · Updated Feb 10, 2026
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 7.8
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | Windows 11 Version 26H1 for ARM64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 11 version 26H1 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 1809 for 32-bit Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 1809 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2019 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2019 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2022 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2022 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 21H2 for 32-bit Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 21H2 for ARM64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 21H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 22H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 22H2 for ARM64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 22H2 for 32-bit Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2025 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 25H2 for ARM64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 25H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 23H2 for ARM64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 23H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2022, 23H2 Edition (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 24H2 for ARM64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 11 Version 24H2 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2025 | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 1607 for 32-bit Systems | (MSRC status code 3) |
| Microsoft update guide | Windows 10 Version 1607 for x64-based Systems | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2016 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2016 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2012 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2012 (Server Core installation) | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2012 R2 | (MSRC status code 3) |
| Microsoft update guide | Windows Server 2012 R2 (Server Core installation) | (MSRC status code 3) |
Vendor remediation references
- 5077179 · build 10.0.28000.1575 · product IDs 20854, 20853
- Vendor guidance · product IDs 20854, 20853
- 5075904 · build 10.0.17763.8389 · product IDs 11568, 11569, 11571, 11572
- Vendor guidance · product IDs 11568, 11569, 11571, 11572
- 5075906 · build 10.0.20348.4773 · product IDs 11923, 11924
- Vendor guidance · product IDs 11923, 11924
- 5075906 · product IDs 11923, 11924
- 5075943 · build 10.0.20348.4711 · product IDs 11923, 11924
- Vendor guidance · product IDs 11923, 11924
- 5075943 · product IDs 11923, 11924
- 5075912 · build 10.0.19044.6937 · product IDs 11929, 11930, 11931
- Vendor guidance · product IDs 11929, 11930, 11931
- 5075912 · build 10.0.19045.6937 · product IDs 12097, 12098, 12099
- Vendor guidance · product IDs 12097, 12098, 12099
- 5075899 · build 10.0.26100.32370 · product IDs 12437, 12436
- Vendor guidance · product IDs 12437, 12436
- 5075899 · product IDs 12437, 12436
- 5075942 · build 10.0.26100.32313 · product IDs 12437, 12436
- Vendor guidance · product IDs 12437, 12436
- 5075942 · product IDs 12437, 12436
- 5077181 · build 10.0.26200.7840 · product IDs 20437, 20438
- Vendor guidance · product IDs 20437, 20438
- 5077212 · build 10.0.26200.7781 · product IDs 20437, 20438
- Vendor guidance · product IDs 20437, 20438
- 5075941 · build 10.0.22631.6649 · product IDs 12242, 12243
- Vendor guidance · product IDs 12242, 12243
- 5075897 · build 10.0.25398.2149 · product IDs 12244
- Vendor guidance · product IDs 12244
- 5075897 · product IDs 12244
- 5077181 · build 10.0.26100.7840 · product IDs 12389
- Vendor guidance · product IDs 12389
- 5077212 · build 10.0.26100.7781 · product IDs 12389, 12390
- Vendor guidance · product IDs 12389, 12390
- 5077181 · build 10.0.26100.7840 · product IDs 12390
- Vendor guidance · product IDs 12390
- 5075999 · build 10.0.14393.8868 · product IDs 10852, 10853, 10816, 10855
- Vendor guidance · product IDs 10852, 10853, 10816, 10855
- 5075971 · build 6.2.9200.25923 · product IDs 10378, 10379
- Vendor guidance · product IDs 10378, 10379
- 5075970 · build 6.3.9600.23022 · product IDs 10483, 10543
- Vendor guidance · product IDs 10483, 10543
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-02-10T03:00:00-05:00
MODIFIED 2026-02-10T03:00:00-05:00
INGESTED 2026-10-08T12:45:18-04:00