CVE-2025-30400: 
vulnerability analysis and mitigation

CVE-2025-30400 is a Windows Desktop Window Manager (DWM) Core Library vulnerability discovered in May 2025. This vulnerability is classified as an Elevation of Privilege (EoP) flaw that allows an authorized attacker to elevate privileges locally through a use-after-free condition. The vulnerability was discovered by the Microsoft Threat Intelligence Center and was actively exploited as a zero-day before patches were made available (Bleeping Computer, Tenable).

The vulnerability is tracked as CVE-2025-30400 and has been assigned a CVSSv3 score of 7.8, rated as Important. It stems from a use-after-free memory corruption issue in the DWM Core Library, cataloged under CWE-416. The vulnerability requires local access to exploit and affects Windows systems running the Desktop Window Manager component (Cybersecurity News, Tenable).

Successful exploitation of CVE-2025-30400 enables an attacker to gain SYSTEM-level privileges - the highest level of access on Windows systems. This elevated access allows attackers to install malicious software, modify system settings, or access sensitive data without detection. The vulnerability's exploitation can lead to complete system compromise when successfully leveraged (Cybersecurity News).

Microsoft released a patch for CVE-2025-30400 as part of its May 2025 Patch Tuesday security updates. Organizations and users are strongly advised to apply the latest security updates immediately to mitigate the risk of exploitation. Microsoft recommends enabling automatic updates and reviewing security policies to ensure rapid deployment of critical patches (Cybersecurity News).