CVE-2025-48818: BitLocker's blind spot
BitLocker has been the cornerstone of Windows security for protecting sensitive data through robust disk encryption. However, in July 2025, a new vulnerability, CVE-2025-48818, has brought BitLocker's security into the spotlight for potential attacks. This vulnerability has a CVSS score of 6.8 with a severity rating "medium." The attack requires neither authentication nor any user interaction.
The attack leverages a time-of-check to time-of-use (TOCTOU) race condition vulnerability. Attackers exploit the tiny time gap between the moment BitLocker checks the encryption status and the moment it uses that information to grant access. This implies that the attackers don't need to log in or know any passwords or have special privileges; instead, they just require access to the physical system to carry out the exploit attack.
Although BitLocker is designed to protect data—even if the device is stolen or lost—if an attacker can physically interact with the device, they could exploit this race condition. Hence, it is considered dangerous especially in environments where devices can be physically accessed by unauthorized people, such as in the case of remote workers and executives on business travel, who are more susceptible to such risks.
Since this vulnerability requires no user interaction or any elevated privileges, and can be exploited quietly and quickly, it is classified as a medium severity threat.
The attacks affect a wide range of Windows devices, such as Windows 10, Windows 11 and a few Windows Server editions.
While there are no known exploit codes in the wild yet, it’s better to be safe than sorry. Here's how you can protect your devices:
Microsoft has released patches for these vulnerabilities; patch your system as soon as possible.
Prioritize patching for remote machines, as they are more vulnerable to exploitation and pose a higher immediate risk.
Prevent any unauthorized individuals from accessing your systems.
Monitor your devices for any unusual activity and ensure that the security policies are up to date.
In the current threat landscape, where threats are constantly evolving, CVE-2025-48818 is a reminder that even with the strongest encryption, if a device falls into the wrong hands, the strongest security pillar can crack.
With ManageEngine Endpoint Central, Patch Manager Plus, and Vulnerability Manager Plus, you can stay ahead—patching vulnerabilities promptly and managing device security proactively. Refer to our forum post to know more about the supported patches to remediate this vulnerability.
Protect your environment before attackers get a chance. Start patching today!