CVE-2025-53718: 
vulnerability analysis and mitigation

CVE-2025-53718 is a use-after-free vulnerability discovered in the Windows Ancillary Function Driver for WinSock. The vulnerability was disclosed on August 12, 2025, affecting multiple versions of Microsoft Windows operating systems. This security flaw allows an authorized attacker with local access to elevate privileges on affected systems (NVD).

The vulnerability has been assigned a CVSS v3.1 base score of 7.0 (HIGH) with the following vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. The technical classification identifies this as a Use After Free (CWE-416) vulnerability in the Windows Ancillary Function Driver for WinSock component (NVD, Rapid7).

The vulnerability affects multiple Windows versions including Windows 10, Windows 11, and various Windows Server editions from 2008 to 2025. If successfully exploited, the vulnerability allows an attacker to gain elevated privileges on the affected system, potentially leading to complete system compromise with high impacts on confidentiality, integrity, and availability (NVD).

Microsoft has released security updates to address this vulnerability across all affected versions of Windows. The fixes are available through various KB updates including KB5063709, KB5063871, KB5063875, KB5063877, KB5063878, KB5063880, KB5063889, KB5063899, KB5063906, and KB5063950 (Rapid7).

The vulnerability was included in Microsoft's August 2025 Patch Tuesday release along with other security updates. It was categorized as one of several vulnerabilities affecting the Windows Ancillary Function Driver for WinSock component (Fortra).