CPSD CryptoPro Secure Disk for Bitlocker before v7.7.4 fails to properly handle decryption errors and allows encrypted volumes to be mounted as plaintext.
https://i.blackhat.com/BH-USA-26/Presentations/US-26-Burch-The-Cost-of-Obscurity-wp.pdf
https://i.blackhat.com/BH-USA-26/Presentations/US-26-Burch-The-Cost-of-Obscurity-Wednesday.pdf