CVE-2024-43563: 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: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-08 · updated 2026-08-19
Weakness: CWE-591

Description

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.20796 — fixed in 10.0.10240.20796
Microsoft Windows 10 1607: before 10.0.14393.7428 — fixed in 10.0.14393.7428
Microsoft Windows 10: before 10.0.17763.6414 — fixed in 10.0.17763.6414
Microsoft Windows 10: before 10.0.19044.5011 — fixed in 10.0.19044.5011
Microsoft Windows 10: before 10.0.19045.5011 — fixed in 10.0.19045.5011
Microsoft Windows 11 21H2: before 10.0.22000.3260 — fixed in 10.0.22000.3260
Microsoft Windows 11: before 10.0.22621.4317 — fixed in 10.0.22621.4317
Microsoft Windows 11: before 10.0.22631.4317 — fixed in 10.0.22631.4317
Microsoft Windows 11: before 10.0.26100.2033 — fixed in 10.0.26100.2033
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.7428 — fixed in 10.0.14393.7428
Microsoft Windows Server 2019: before 10.0.17763.6414 — fixed in 10.0.17763.6414
Microsoft Windows Server 2022: before 10.0.20348.2762 — fixed in 10.0.20348.2762
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1189 — fixed in 10.0.25398.1189
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.20796 — fixed in 10.0.10240.20796
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.7428 — fixed in 10.0.14393.7428
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.6414 — fixed in 10.0.17763.6414
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.5011 — fixed in 10.0.19044.5011
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.5011 — fixed in 10.0.19045.5011
Microsoft Windows 11 21H2: from 10.0.22000.0 before 10.0.22000.3260 — fixed in 10.0.22000.3260
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.4317 — fixed in 10.0.22621.4317
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.4317 — fixed in 10.0.22631.4317
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.4317 — fixed in 10.0.22631.4317
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.2033 — fixed in 10.0.26100.2033
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.25118 — fixed in 6.2.9200.25118
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.22221 — fixed in 6.3.9600.22221
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.7428 — fixed in 10.0.14393.7428
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.6414 — fixed in 10.0.17763.6414
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.2762 — fixed in 10.0.20348.2762
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1189 — fixed in 10.0.25398.1189

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.20796; Microsoft Windows 10 1607 10.0.14393.7428; Microsoft Windows 10 10.0.17763.6414; Microsoft Windows 10 10.0.19044.5011; Microsoft Windows 10 10.0.19045.5011; Microsoft Windows 11 21H2 10.0.22000.3260; Microsoft Windows 11 10.0.22621.4317; Microsoft Windows 11 10.0.22631.4317; Microsoft Windows 11 10.0.26100.2033; Microsoft Windows Server 2016 10.0.14393.7428; Microsoft Windows Server 2019 10.0.17763.6414; Microsoft Windows Server 2022 10.0.20348.2762. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43563

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