Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2025-21418 is an elevation of privilege vulnerability in Windows Ancillary Function Driver for WinSock (rated Important, CVSS 7.8). Microsoft reports that it is being exploited.
Exploited1 version
Facts
- Microsoft id
CVE-2025-21418- Status
- Exploited
- Products
- Windows Ancillary Function Driver for WinSock
- Severity
- Important
- Impact
- Elevation of Privilege
- CVSS
- 7.8
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
- Exploited
- Yes
- Publicly disclosed
- No
- Exploitability
- Exploitation Detected
- Customer action required
- Yes
- Release
- 2025-Feb
- Assigned by
- Microsoft
- Weakness
- CWE-122: Heap-based Buffer Overflow
- MSRC revision
- 1.0
- First captured by us
- (from our first import of this list)
- Microsoft last modified
- Source
- Security updates · open the original at Microsoft
Microsoft's revision notes
- Revision 1.0, 2025-02-11:
Information published.
Microsoft says
What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
What Microsoft changed
One version so far. If Microsoft edits it, each change shows here with what was removed and added.
First version we captured ·
As first seen: Exploited
- Status
- Exploited
Seen by us · Microsoft's timestamp · Microsoft's page