CVE-2023-35632: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 6.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-12 · updated 2026-06-17
Weakness: CWE-190

Description

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.20345 — fixed in 10.0.10240.20345
Microsoft Windows 10 1607: before 10.0.14393.6529 — fixed in 10.0.14393.6529
Microsoft Windows 10: before 10.0.17763.5206 — fixed in 10.0.17763.5206
Microsoft Windows 10: before 10.0.19041.3803 — fixed in 10.0.19041.3803
Microsoft Windows 10: before 10.0.19045.3803 — fixed in 10.0.19045.3803
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: all versions
Microsoft Windows Server 2019: all versions
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.20345 — fixed in 10.0.10240.20345
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.6529 — fixed in 10.0.14393.6529
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.5206 — fixed in 10.0.17763.5206
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.3803 — fixed in 10.0.19044.3803
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.3803 — fixed in 10.0.19045.3803
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.26864 — fixed in 6.1.7601.26864
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.24614 — fixed in 6.2.9200.24614
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.21715 — fixed in 6.3.9600.21715
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.6529 — fixed in 10.0.14393.6529
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.5206 — fixed in 10.0.17763.5206

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.20345; Microsoft Windows 10 1607 10.0.14393.6529; Microsoft Windows 10 10.0.17763.5206; Microsoft Windows 10 10.0.19041.3803; Microsoft Windows 10 10.0.19045.3803; Microsoft Windows 10 Version 1507 10.0.10240.20345; Microsoft Windows 10 1607 10.0.14393.6529; Microsoft Windows 10 10.0.17763.5206; Microsoft Windows 10 10.0.19044.3803; Microsoft Windows 10 10.0.19045.3803; Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.26864; Microsoft Windows Server 2012 6.2.9200.24614. Check the vendor advisory for mitigations.

References

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