CVE tracker / CVE-2025-62217

CVE-2025-62217

CVE-2025-62217 is the Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability. Microsoft rates it Important, CVSS 7.0. It is not in CISA's Known Exploited Vulnerabilities catalog. Published November 11, 2025.

Risk summary

HighElevation of Privilege

7.0

CVSS v3 base

0.3%

EPSS: chance of exploitation in 30 days

High

Severity

Important

Microsoft's rating

More Likely

Microsoft: exploitation

In CISA KEV

Microsoft describes it: “Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.”

How to fix it

Microsoft lists 35 affected products and the update that fixes each:

KB5068779 · fixed build 10.0.25398.1965
Windows Server 2022, 23H2 Edition (Server Core installation)
KB5068781 · fixed build 10.0.19044.6575, 10.0.19045.6575
Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, and 1 more
KB5068787 · fixed build 10.0.20348.4405
Windows Server 2022, Windows Server 2022 (Server Core installation)
KB5068791 · fixed build 10.0.17763.8027
Windows Server 2019 (Server Core installation), Windows Server 2019, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems
KB5068861 · fixed build 10.0.26100.7171, 10.0.26200.7171
Windows Server 2025 (Server Core installation), Windows 11 Version 25H2 for ARM64-based Systems, Windows Server 2025, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, and 1 more
KB5068864 · fixed build 10.0.14393.8594
Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems
KB5068865 · fixed build 10.0.22631.6199
Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems
KB5068904 · fixed build 6.1.7601.28021
Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
KB5068905 · fixed build 6.3.9600.22869
Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)
KB5068906 · fixed build 6.0.6003.23624
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation), Windows Server 2008 for x64-based Systems Service Pack 2, Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation), Windows Server 2008 for 32-bit Systems Service Pack 2
KB5068907 · fixed build 6.2.9200.25768
Windows Server 2012 (Server Core installation), Windows Server 2012

What Microsoft changed

November 11, 2025: Information published.

Details

Weakness: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Publicly disclosed (Microsoft): No
Exploited (Microsoft): No
Known exploited (CISA KEV): Not listed
Published: November 11, 2025
Last revised: November 11, 2025

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.