A security vulnerability, designated CVE-2025-48818, has been identified in Windows BitLocker encryption, allowing attackers to exploit a time-of-check time-of-use (TOCTOU) race condition to bypass encryption. The vulnerability has a CVSS score of 6.8 and affects multiple versions of Windows, specifically targeting BitLocker Device Encryption. It requires physical access to the target system, has low attack complexity, and does not require user interaction. The affected Windows platforms include Windows 10 (versions 1607, 21H2, 22H2), Windows 11 (versions 22H2, 23H2, 24H2), and Windows Server editions (2016, 2022, 2025). Microsoft has released security updates to address this vulnerability, with key patches for specific Windows versions. System administrators are advised to install these updates and enhance physical security measures to prevent unauthorized access.