CVE-2025-64679 is a heap-based buffer overflow vulnerability classified under CWE-122, found in the Windows Desktop Window Manager (DWM) Core Library of Microsoft Windows 10 Version 1507 (build 10.0.10240.0). The vulnerability arises from improper handling of heap memory, allowing an attacker with authorized local access and limited privileges to overflow a buffer on the heap. This overflow can corrupt memory, leading to arbitrary code execution in the context of a higher-privileged process, effectively enabling privilege escalation. The attack vector requires local access with some privileges but does not require user interaction, making exploitation more straightforward once access is gained. The vulnerability affects confidentiality, integrity, and availability by potentially allowing attackers to execute arbitrary code with elevated privileges, manipulate system processes, or cause system crashes. The CVSS v3.1 score of 7.8 reflects the high impact and relatively low complexity of exploitation. No public exploits or patches are currently available, but the vulnerability is officially published and reserved as of late 2025. The affected Windows 10 Version 1507 is an early release of Windows 10, which is largely out of mainstream support, but still in use in some legacy environments.

The primary impact of CVE-2025-64679 is local privilege escalation, which can lead to full system compromise if exploited. Attackers who gain limited access to a vulnerable system can leverage this flaw to elevate their privileges to SYSTEM or equivalent, bypassing security controls. This can result in unauthorized access to sensitive data, installation of persistent malware, disruption of system operations, and potential lateral movement within enterprise networks. The vulnerability affects confidentiality by enabling unauthorized data access, integrity by allowing modification of system files or processes, and availability by potentially causing system instability or crashes. Organizations relying on Windows 10 Version 1507, especially in critical infrastructure, industrial control systems, or legacy environments, face increased risk of targeted attacks. Although no known exploits are currently in the wild, the availability of detailed vulnerability information and the high CVSS score suggest that attackers may develop exploits, increasing the urgency for mitigation.

1. Upgrade to a supported and fully patched version of Windows 10 or later, as Windows 10 Version 1507 is out of mainstream support and unlikely to receive security updates. 2. If upgrading is not immediately possible, implement strict access controls to limit local user privileges and reduce the number of users with local access. 3. Employ application whitelisting and endpoint protection solutions capable of detecting anomalous behavior indicative of privilege escalation attempts. 4. Monitor system logs and security event logs for unusual activity related to DWM or privilege escalation attempts. 5. Use virtualization-based security features and enable Windows Defender Credential Guard where possible to mitigate credential theft post-exploitation. 6. Restrict physical and remote access to vulnerable systems to trusted personnel only. 7. Prepare incident response plans to quickly address potential exploitation scenarios. 8. Regularly audit legacy systems and plan for decommissioning or upgrading unsupported operating systems to reduce attack surface.