CVE-2025-48813: 
vulnerability analysis and mitigation

CVE-2025-48813 is a vulnerability related to the use of an expired key in Virtual Secure Mode that affects multiple Microsoft Windows versions. The vulnerability was discovered and disclosed on October 14, 2025, affecting various Windows versions including Windows 10, Windows 11, and Windows Server editions. This security flaw allows an authorized attacker to perform spoofing locally (NVD, Microsoft Advisory).

The vulnerability is classified with a CVSS v3.1 base score of 4.7 (Medium) according to NVD's assessment, while Microsoft Corporation assigned it a score of 6.3 (Medium). The vulnerability vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N, indicating local access, high attack complexity, low privileges required, no user interaction, and high impact on integrity. The weakness is categorized as CWE-324 (Use of a Key Past its Expiration Date) (NVD).

The vulnerability's exploitation could allow an authorized attacker to perform spoofing activities locally within the affected system. This primarily affects the system's integrity, with no direct impact on confidentiality or availability (NVD).

Microsoft has released security updates to address this vulnerability. Affected users should update their systems to the latest versions. The fix is included in the October 2025 Patch Tuesday updates for various Windows versions including Windows 10 1809, Windows Server 2019, Windows Server 2022, and multiple Windows 11 versions (NVD, Fortra).