Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Security updates
10.0.17763.7558 — https://support.microsoft.com/help/5062557
10.0.20348.3932 — https://support.microsoft.com/help/5062572
10.0.19044.6093 — https://support.microsoft.com/help/5062554
10.0.22621.5624 — https://support.microsoft.com/help/5062552
10.0.26100.4652 — https://support.microsoft.com/help/5062553
10.0.25398.1732 — https://support.microsoft.com/help/5062570
10.0.10240.21073 — https://support.microsoft.com/help/5062561
10.0.14393.8246 — https://support.microsoft.com/help/5062560
6.0.6003.23418 — https://support.microsoft.com/help/5062624
6.0.6003.23418 — https://support.microsoft.com/help/5062618
6.1.7601.27820 — https://support.microsoft.com/help/5062632
6.1.7601.27820 — https://support.microsoft.com/help/5062619
6.2.9200.25573 — https://support.microsoft.com/help/5062592
6.3.9600.22676 — https://support.microsoft.com/help/5062597
Vulnerabilities 1
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High 7.8
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.
Revision history
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#1
Information published.
References
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CVE-2025-49661 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49661
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss