CVE-2025-49661

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

State: Published
Severity: 7.8 High
Published: Jul 8, 2025
Updated: Feb 26, 2026
Reserved: Jun 9, 2025

Description

Untrusted pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-822 Untrusted Pointer Dereference

Affected Products

Product	Versions
Windows 10 Version 1507Microsoft	10.0.10240.0 to before 10.0.10240.21073Affected
Windows 10 Version 1607Microsoft	10.0.14393.0 to before 10.0.14393.8246Affected
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.7558Affected
Windows 10 Version 21H2Microsoft	10.0.19044.0 to before 10.0.19044.6093Affected
Windows 10 Version 22H2Microsoft	10.0.19045.0 to before 10.0.19045.6093Affected
Windows 11 version 22H2Microsoft	10.0.22621.0 to before 10.0.22621.5624Affected
Windows 11 version 22H3Microsoft	10.0.22631.0 to before 10.0.22631.5624Affected
Windows 11 Version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.5624Affected
Windows 11 Version 24H2Microsoft	10.0.26100.0 to before 10.0.26100.4652Affected
Windows Server 2008 R2 Service Pack 1Microsoft	6.1.7601.0 to before 6.1.7601.27820Affected
Windows Server 2008 R2 Service Pack 1 (Server Core installation)Microsoft	6.1.7601.0 to before 6.1.7601.27820Affected
Windows Server 2008 Service Pack 2Microsoft	6.0.6003.0 to before 6.0.6003.23418Affected
Windows Server 2008 Service Pack 2 (Server Core installation)Microsoft	6.0.6003.0 to before 6.0.6003.23418Affected
Windows Server 2012Microsoft	6.2.9200.0 to before 6.2.9200.25573Affected
Windows Server 2012 (Server Core installation)Microsoft	6.2.9200.0 to before 6.2.9200.25573Affected
Windows Server 2012 R2Microsoft	6.3.9600.0 to before 6.3.9600.22676Affected
Windows Server 2012 R2 (Server Core installation)Microsoft	6.3.9600.0 to before 6.3.9600.22676Affected
Windows Server 2016Microsoft	10.0.14393.0 to before 10.0.14393.8246Affected
Windows Server 2016 (Server Core installation)Microsoft	10.0.14393.0 to before 10.0.14393.8246Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.7558Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.7558Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.3932Affected
Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft	10.0.25398.0 to before 10.0.25398.1732Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.4652Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.4652Affected

References

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerabilityvendor-advisorypatch

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.