Cold boot attacks have been around since 2008 and a security firm recently exposed a new cold boot vulnerability. If an attacker is able to get physical access to the machine, they're able to disable the current technology that overwrites cold boot RAM and steal any sensitive data stored on the computer. There is currently no patch available that stops attacker from being able to do this. It is recommended that physical access to machines is kept to a minimum and that computers are configured to shut down and require a BitLocker credential is required on reboot.
Relevant URL(s): https://thehackernews.com/2018/09/cold-boot-attack-encryption.html