CVE-2025-21418
unknown
KEV
CVSS v3
—
CVSS v4 NEW
—
VIR risk
1.5
Description
Microsoft Windows Ancillary Function Driver for WinSock contains a heap-based buffer overflow vulnerability that allows for privilege escalation, enabling a local attacker to gain SYSTEM privileges.
CISA KEV
- Vendor
- Microsoft
- Product
- Windows
- Due date
- 2025-03-04
Predictions
Exploit likelihood
99%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
Source: Microsoft Security Response Center · View original ↗ · proprietary-no-redistribution
Full prose not cached — VIR stores only structured fields (affected/fixed versions, references) for this source. Click "View original" above for the vendor's full advisory.
Affected
| Vendor | Product | Version |
|---|---|---|
| microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | |
| microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | |
| microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | |
| microsoft | Windows Server 2012 | |
| microsoft | Windows Server 2012 (Server Core installation) | |
| microsoft | Windows Server 2012 R2 | |
| microsoft | Windows Server 2012 R2 (Server Core installation) | |
| microsoft | Microsoft Outlook for Android | |
| microsoft | Windows 10 for 32-bit Systems | |
| microsoft | Windows 10 for x64-based Systems | |
| microsoft | Microsoft Excel 2016 (32-bit edition) | |
| microsoft | Microsoft Excel 2016 (64-bit edition) | |
| microsoft | Microsoft Office 2016 (32-bit edition) | |
| microsoft | Microsoft Office 2016 (64-bit edition) | |
| microsoft | Windows Server 2016 | |
| microsoft | Office Online Server | |
| microsoft | Windows 10 Version 1607 for 32-bit Systems | |
| microsoft | Windows 10 Version 1607 for x64-based Systems | |
| microsoft | Windows Server 2016 (Server Core installation) | |
| microsoft | Microsoft AutoUpdate for Mac | |
| microsoft | Microsoft SharePoint Enterprise Server 2016 | |
| microsoft | Windows 10 Version 1809 for 32-bit Systems | |
| microsoft | Windows 10 Version 1809 for x64-based Systems | |
| microsoft | Windows Server 2019 | |
| microsoft | Windows Server 2019 (Server Core installation) | |
| microsoft | Microsoft Office 2019 for 32-bit editions | |
| microsoft | Microsoft Office 2019 for 64-bit editions | |
| microsoft | Microsoft SharePoint Server 2019 | |
| microsoft | Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) | |
| microsoft | Visual Studio Code | |
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.