Race Condition Vulnerability in Windows Ancillary Function Driver for WinSock
CVE-2025-53134

7HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Vendor
CVE Published:
12 August 2025

What is CVE-2025-53134?

A race condition vulnerability exists within the Windows Ancillary Function Driver for WinSock, which could allow an authorized attacker to exploit improper synchronization when concurrently accessing shared resources. This flaw may lead to local privilege escalation, enabling attackers to gain higher-level permissions on the affected system. Organizations should ensure they are using updated versions of the driver to mitigate the risks associated with this vulnerability.

Affected Version(s)

Windows 10 Version 1507 32-bit Systems 10.0.10240.0 < 10.0.10240.21100

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.8330

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.7678

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-53134 : Race Condition Vulnerability in Windows Ancillary Function Driver for WinSock