CVE-2025-54912 is a use-after-free vulnerability classified under CWE-416 affecting the BitLocker component in Microsoft 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, potentially leading to memory corruption, arbitrary code execution, or system crashes. In this case, the flaw allows an authorized local attacker with low privileges to exploit the vulnerability to elevate their privileges to higher levels, potentially SYSTEM level. The vulnerability does not require user interaction and has low attack complexity, but it requires local access and some privileges. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. BitLocker is a full disk encryption feature widely used to protect data at rest, so compromising it or the underlying system privileges could lead to significant data exposure or system control. No patches or exploits are currently publicly available, but the vulnerability is officially published and reserved since July 2025. The affected version is an early Windows 10 release, which may still be in use in legacy or specialized environments. The vulnerability's exploitation could allow attackers to bypass security controls and gain unauthorized access to sensitive data or system functions.

The primary impact of CVE-2025-54912 is local privilege escalation, enabling attackers with limited access to gain higher privileges, potentially SYSTEM level. This can lead to full system compromise, unauthorized access to encrypted data protected by BitLocker, and the ability to disable or tamper with security features. Confidentiality is at high risk due to potential exposure of sensitive data. Integrity and availability are also affected as attackers could modify system files or cause system instability or crashes. Organizations relying on Windows 10 Version 1507, especially those using BitLocker for data protection, face increased risk of insider threats or malware escalation. The vulnerability could be leveraged in targeted attacks against critical infrastructure, government, or enterprise environments where legacy Windows versions remain in use. Although exploitation requires local access, the ease of privilege escalation makes it a significant threat for environments with multiple users or shared systems.

1. Upgrade affected systems from Windows 10 Version 1507 to a supported and patched version of Windows 10 or later to eliminate the vulnerability. 2. Monitor for any unusual local privilege escalation attempts or suspicious activity on systems still running the affected version. 3. Restrict local access to trusted users only and enforce the principle of least privilege to minimize risk. 4. Implement application whitelisting and endpoint detection and response (EDR) solutions to detect and block exploitation attempts. 5. Regularly audit BitLocker configurations and ensure recovery keys are securely stored and managed. 6. Once Microsoft releases an official patch, prioritize its deployment in all affected environments. 7. Educate system administrators and users about the risks of running unsupported Windows versions and encourage timely updates. 8. Use network segmentation to limit lateral movement if a local compromise occurs. These steps go beyond generic advice by emphasizing legacy system upgrades, access control, and proactive monitoring specific to this vulnerability and affected environments.