Privilege escalation in Microsoft Windows Ancillary Function Driver for WinSock



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-49661
CWE-ID CWE-822
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Untrusted Pointer Dereference

EUVDB-ID: #VU112519

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-49661

CWE-ID: CWE-822 - Untrusted Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to untrusted pointer dereference in Windows Ancillary Function Driver for WinSock. A local user can gain elevated privileges on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

Windows: 10 21H2 10.0.19041.3920 - 11 24H2 10.0.26100.4349

Windows Server: 2008 6.0.6003.22567 - 2025 10.0.26100.4349

CPE2.3 External links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49661


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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