Popular security expert James Forshaw has discovered two critical flaws in the driver that TrueCrypt installs on Windows systems. The original authors of TrueCrypt warned users about the possible presence of unfixed security issues and invited them to switch to BitLocker, the full-disk encryption feature implemented by Microsoft. The vulnerabilities and related severity are listed below: Keyfile mixing is not cryptographically sound. An attacker can exploit the vulnerability to obtain elevated privileges on a system if they have access to a limited user account.”]
Source: https://securityaffairs.co/wordpress/40584/security/truecrypt-security-flaws.html