Windows BitLocker Vulnerability Lets Attackers Bypass Security Protections

Microsoft has disclosed a significant security vulnerability in Windows BitLocker that allows attackers to bypass critical security protections through a physical attack vector.

The vulnerability, designated as CVE-2025-48818, was officially released on July 8, 2025, and affects the disk encryption system that millions of users rely on to protect sensitive data.

Security Flaw Details

The newly discovered vulnerability represents a time-of-check time-of-use (TOCTOU) race condition that enables unauthorized attackers to circumvent BitLocker’s security features.

This type of vulnerability occurs when there’s a gap between checking a security condition and actually using the resource, creating a window of opportunity for malicious actors to exploit the system.

The flaw carries an “Important” severity rating from Microsoft, with a CVSS score of 6.8 out of 10, indicating substantial risk to ...