Jul 2025: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2025-49661 Published on July 8, 2025

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

Vendor Advisory NVD

Weakness Type

Untrusted Pointer Dereference

The program obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.

Products Associated with CVE-2025-49661

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Microsoft Windows Server 2008

Microsoft Windows Server 2012

Microsoft Windows Server 2025

Microsoft Windows 10 1507

Microsoft Windows 10

Microsoft Windows 11

Microsoft Windows 11 23h2

Microsoft Windows 11 24h2

Microsoft Windows Server 2016

Microsoft Windows Server 2019

Microsoft Windows Server 2022

Microsoft Windows Server 2022 23h2

Microsoft Windows Server 23h2

Microsoft Windows Server 2008 Sp2

Microsoft Windows Server 2008 R2

Microsoft Windows Server 2012 R2

Affected Versions

Microsoft Windows 10 Version 1507:

Version 10.0.10240.0 and below 10.0.10240.21073 is affected.

Microsoft Windows 10 Version 1607:

Version 10.0.14393.0 and below 10.0.14393.8246 is affected.

Microsoft Windows 10 Version 1809:

Version 10.0.17763.0 and below 10.0.17763.7558 is affected.

Microsoft Windows 10 Version 21H2:

Version 10.0.19044.0 and below 10.0.19044.6093 is affected.

Microsoft Windows 10 Version 22H2:

Version 10.0.19045.0 and below 10.0.19045.6093 is affected.

Microsoft Windows 11 version 22H2:

Version 10.0.22621.0 and below 10.0.22621.5624 is affected.

Microsoft Windows 11 version 22H3:

Version 10.0.22631.0 and below 10.0.22631.5624 is affected.

Microsoft Windows 11 Version 23H2:

Version 10.0.22631.0 and below 10.0.22631.5624 is affected.

Microsoft Windows 11 Version 24H2:

Version 10.0.26100.0 and below 10.0.26100.4652 is affected.

Microsoft Windows Server 2008 R2 Service Pack 1:

Version 6.1.7601.0 and below 6.1.7601.27820 is affected.

Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation):

Version 6.1.7601.0 and below 6.1.7601.27820 is affected.

Microsoft Windows Server 2008 Service Pack 2:

Version 6.0.6003.0 and below 6.0.6003.23418 is affected.

Microsoft Windows Server 2008 Service Pack 2 (Server Core installation):

Version 6.0.6003.0 and below 6.0.6003.23418 is affected.

Microsoft Windows Server 2012:

Version 6.2.9200.0 and below 6.2.9200.25573 is affected.

Microsoft Windows Server 2012 (Server Core installation):

Version 6.2.9200.0 and below 6.2.9200.25573 is affected.

Microsoft Windows Server 2012 R2:

Version 6.3.9600.0 and below 6.3.9600.22676 is affected.

Microsoft Windows Server 2012 R2 (Server Core installation):

Version 6.3.9600.0 and below 6.3.9600.22676 is affected.

Microsoft Windows Server 2016:

Version 10.0.14393.0 and below 10.0.14393.8246 is affected.

Microsoft Windows Server 2016 (Server Core installation):

Version 10.0.14393.0 and below 10.0.14393.8246 is affected.

Microsoft Windows Server 2019:

Version 10.0.17763.0 and below 10.0.17763.7558 is affected.

Microsoft Windows Server 2019 (Server Core installation):

Version 10.0.17763.0 and below 10.0.17763.7558 is affected.

Microsoft Windows Server 2022:

Version 10.0.20348.0 and below 10.0.20348.3932 is affected.

Microsoft Windows Server 2022, 23H2 Edition (Server Core installation):

Version 10.0.25398.0 and below 10.0.25398.1732 is affected.

Microsoft Windows Server 2025:

Version 10.0.26100.0 and below 10.0.26100.4652 is affected.

Microsoft Windows Server 2025 (Server Core installation):

Version 10.0.26100.0 and below 10.0.26100.4652 is affected.

Exploit Probability

EPSS

0.06%

Percentile

19.90%