Microsoft BitLocker Bypassed by YellowKey 0-Day

A newly surfaced security threat poses a significant risk to Microsoft users, as unpatched zero-day vulnerabilities allow the Microsoft BitLocker encryption to be bypassed. Dubbed “YellowKey,” this critical flaw grants attackers full access to locked system drives used in Windows 11, Server 2022, and Server 2025. Highlighted alongside is “GreenPlasma,” a vulnerability that exploits the Windows CTFMON service, allowing unprivileged users to escalate their privileges using specific file manipulations.

These discoveries emerged following dissatisfaction with Microsoft’s handling of earlier security disclosures. The exploits now threaten millions of enterprise and government devices, with speculation suggesting intentional backdoors. YellowKey primarily targets WinRE, requiring attackers only to connect a prepared USB or modify the EFI partition directly. Presently, Microsoft has not issued a patch, leaving security experts recommending system access restrictions.

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Windows BitLocker 0-Day Vulnerability Enables Access to Encrypted Drives