Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2025-21210
CVE-2025-21210:
vulnerability analysis and mitigation
Overview
A critical vulnerability in Windows BitLocker, identified as CVE-2025-21210, was discovered and disclosed in December 2024. This information disclosure vulnerability affects Microsoft's BitLocker full-disk encryption system, specifically targeting its AES-XTS encryption mode implementation (CyberSecurity News).
Technical details
The vulnerability exploits a design flaw in BitLocker's crash dump handling mechanism. The attack involves manipulating the HKLM\System\ControlSet001\Control\CrashControl registry key to disable the dumpfve.sys crash dump filter driver, which forces the Windows kernel to write unencrypted hibernation images directly to disk. The flaw specifically affects the AES-XTS encryption mode, which was designed to be more secure than AES-CBC against bit-flipping attacks (CyberSecurity News).
Impact
When successfully exploited, this vulnerability allows attackers with physical access to the device to expose sensitive data stored in RAM, including passwords, encryption keys, and personal information. The impact is particularly severe in scenarios involving corporate espionage or data recovery situations where physical access to devices is possible (CyberSecurity News).
Mitigation and workarounds
Microsoft has addressed this vulnerability by releasing an updated version of the fvevol.sys driver. The patch implements a validation mechanism that ensures dumpfve.sys remains listed in the DumpFilters registry value. If the driver is missing or corrupted, Windows will crash during boot-up, preventing unencrypted data from being written to disk. Users are strongly advised to apply Microsoft's security patch immediately (CyberSecurity News).
Additional resources
Source: This report was generated using AI
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