CVE-2025-21217: 
vulnerability analysis and mitigation

Windows NTLM Spoofing Vulnerability, identified as CVE-2025-21217, was disclosed on January 14, 2025. The vulnerability affects multiple versions of Microsoft Windows operating systems, including Windows 10, Windows 11, and various Windows Server editions (NVD).

The vulnerability has been assigned a CVSS v3.1 Base Score of 6.5 (Medium) with the following vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. This indicates that the vulnerability is network-accessible, requires low attack complexity, needs no privileges, but does require user interaction. The vulnerability is classified under CWE-693 (Protection Mechanism Failure) (NVD).

The vulnerability primarily affects confidentiality (rated as High) while having no direct impact on integrity or availability. As an NTLM spoofing vulnerability, it could potentially allow attackers to intercept and capture authentication credentials (NVD).

Microsoft has released security updates to address this vulnerability. The fixes are available for affected versions of Windows, including Windows 10 (various versions), Windows 11, and Windows Server editions. Users are advised to apply the latest security updates (Microsoft Advisory).