CVE-2025-49661: 
vulnerability analysis and mitigation

A vulnerability identified as CVE-2025-49661 was discovered in the Windows Ancillary Function Driver for WinSock. The vulnerability was disclosed on July 8, 2025, and affects various Microsoft Windows operating systems. The issue stems from an untrusted pointer dereference that could allow an authorized attacker to elevate privileges locally (NVD, CVE).

The vulnerability has been assigned a CVSS v3.1 base score of 7.8 (HIGH) with the following vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The technical classification falls under CWE-822, which refers to Untrusted Pointer Dereference. The vulnerability requires local access and low privileges to exploit, with no user interaction needed (NVD).

If successfully exploited, this vulnerability allows an authorized attacker with local access to elevate their privileges on the affected system. The high CVSS score indicates severe potential impacts on confidentiality, integrity, and availability of the system (NVD).

Microsoft has acknowledged the vulnerability and provided updates through their security update guide. Affected systems should be patched according to Microsoft's security advisory (Microsoft Advisory).