CVE-2025-53155 is a heap-based buffer overflow vulnerability identified in the Hyper-V virtualization component of Microsoft Windows 10 Version 1507 (build 10240.0). This vulnerability is classified under CWE-122, indicating improper memory handling leading to buffer overflow on the heap. An authorized attacker with local access and limited privileges can exploit this flaw to execute arbitrary code with elevated privileges, effectively allowing privilege escalation. The vulnerability does not require user interaction, making it more straightforward to exploit once local access is obtained. The buffer overflow occurs due to insufficient bounds checking in Hyper-V's handling of certain data structures or operations, which leads to memory corruption. Successful exploitation can compromise system confidentiality, integrity, and availability by allowing attackers to gain SYSTEM-level privileges, potentially installing persistent malware or disabling security controls. Although no public exploits have been reported yet, the vulnerability is rated with a CVSS v3.1 score of 7.8 (high severity), reflecting the significant risk posed by this flaw. The vulnerability affects only the initial release of Windows 10 (Version 1507), which is an older version but may still be in use in legacy environments. Microsoft has not yet released a patch, but organizations are advised to monitor for updates and apply them promptly once available.

The primary impact of CVE-2025-53155 is local privilege escalation, enabling attackers with limited access to gain full administrative control over affected Windows 10 Version 1507 systems. This can lead to complete system compromise, allowing attackers to bypass security controls, access sensitive data, install persistent malware, or disrupt system availability. Organizations relying on Hyper-V virtualization on legacy Windows 10 systems are particularly vulnerable. The vulnerability could be exploited by malicious insiders or attackers who have gained limited local access through other means. The compromise of administrative privileges can also facilitate lateral movement within networks, increasing the risk to enterprise environments. Although no known exploits are currently in the wild, the high CVSS score and the critical nature of privilege escalation in security contexts make this a significant threat. Legacy systems in critical infrastructure sectors, government, and enterprises with strict compliance requirements face heightened risks if this vulnerability is not addressed.

1. Apply security patches from Microsoft as soon as they become available for Windows 10 Version 1507 and Hyper-V components. 2. If patching is not immediately possible, restrict local access to trusted users only, minimizing the risk of exploitation by unauthorized personnel. 3. Disable Hyper-V on Windows 10 Version 1507 systems if virtualization is not required, reducing the attack surface. 4. Employ application whitelisting and endpoint detection and response (EDR) solutions to detect anomalous privilege escalation attempts. 5. Regularly audit and monitor local user accounts and privileges to detect suspicious activity early. 6. Consider upgrading legacy Windows 10 systems to supported versions that receive ongoing security updates. 7. Implement network segmentation to limit lateral movement in case of compromise. 8. Educate system administrators and users about the risks of local privilege escalation vulnerabilities and the importance of timely patching.