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High severity · published Aug 12, 2025
CVE-2025-49762
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
7.0
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 10 Version 1507 · Microsoft
10.0.10240.0 before 10.0.10240.21100 · source: vendor
W1
Windows 10 Version 1607 · Microsoft
10.0.14393.0 before 10.0.14393.8330 · source: vendor
W1
Windows 10 Version 1809 · Microsoft
10.0.17763.0 before 10.0.17763.7678 · source: vendor
W1
Windows 10 Version 21H2 · Microsoft
10.0.19044.0 before 10.0.19044.6216 · source: vendor
W1
Windows 10 Version 22H2 · Microsoft
10.0.19045.0 before 10.0.19045.6216 · source: vendor
W1
Windows 11 Version 23H2 · Microsoft
10.0.22631.0 before 10.0.22631.5768 · source: vendor
W1
Windows 11 Version 24H2 · Microsoft
10.0.26100.0 before 10.0.26100.4946 · source: vendor
W1
Windows 11 version 22H2 · Microsoft
10.0.22621.0 before 10.0.22621.5768 · source: vendor
W1
Windows 11 version 22H3 · Microsoft
10.0.22631.0 before 10.0.22631.5768 · source: vendor
WS
Windows Server 2008 R2 Service Pack 1 · Microsoft
6.1.7601.0 before 6.1.7601.27872 · source: vendor
WS
Windows Server 2008 R2 Service Pack 1 (Server Core installation) · Microsoft
6.1.7601.0 before 6.1.7601.27872 · source: vendor
WS
Windows Server 2008 Service Pack 2 · Microsoft
6.0.6003.0 before 6.0.6003.23471 · source: vendor
Affected product
W1
Windows 10 Version 1507
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-49762
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-49762
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49762
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