CVE-2025-54112 is a use-after-free vulnerability classified under CWE-416, found in the Microsoft Virtual Hard Drive (VHD) component of Windows 10 Version 1507 (build 10.0.10240.0). Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, leading to undefined behavior such as memory corruption, crashes, or arbitrary code execution. In this case, an authorized local attacker with low privileges can exploit this flaw to elevate their privileges on the affected system. The vulnerability requires local access and has a high attack complexity, indicating that exploitation is not trivial and may require detailed knowledge of the system state or specific conditions. The CVSS v3.1 base score is 7.0, reflecting high severity due to the potential for complete compromise of confidentiality, integrity, and availability. No public exploits or patches have been released yet, and the affected version is an early release of Windows 10, which is largely superseded by newer versions. However, legacy systems still in operation remain vulnerable. The vulnerability highlights the risks associated with memory management errors in critical system components like VHD, which manages virtual disk files and is integral to virtualization and storage functionalities in Windows.

If exploited, this vulnerability allows a low-privileged local attacker to escalate privileges to higher levels, potentially SYSTEM level, enabling full control over the affected machine. This can lead to unauthorized access to sensitive data, installation of persistent malware, disruption of system operations, and compromise of system integrity. Organizations relying on legacy Windows 10 Version 1507 systems, especially in environments where local user access is possible (e.g., shared workstations, terminal servers), face increased risk. The vulnerability could be leveraged as part of a multi-stage attack chain to bypass security controls or move laterally within networks. Although no known exploits exist currently, the presence of a high-severity vulnerability in a core OS component necessitates urgent attention to prevent future exploitation. The impact extends to confidentiality, integrity, and availability, making it a critical concern for enterprise environments, government agencies, and critical infrastructure operators still running this outdated OS version.

1. Upgrade affected systems 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 patches. 2. If upgrading is not immediately possible, restrict local user access to affected systems to trusted personnel only, minimizing the risk of local exploitation. 3. Implement strict access control policies and use application whitelisting to prevent unauthorized execution of code. 4. Employ endpoint detection and response (EDR) solutions to monitor for suspicious activities indicative of privilege escalation attempts. 5. Regularly audit and remove unnecessary local accounts or privileges that could be leveraged by attackers. 6. Monitor security advisories from Microsoft for any forthcoming patches or mitigations specific to this vulnerability. 7. Use virtualization and sandboxing techniques to isolate critical workloads from potentially compromised systems. 8. Educate users about the risks of local privilege escalation and enforce policies to prevent unauthorized physical or remote access.