@Wander RCE = Remote Code Execution.

In terms of vulnerabilities and exploits, RCE is about as bad as it gets.

Local Code Execution, OTOH, requires an account local to the host at a minimum, less bad.

In some instances (e.g. if you have hardware level access) it may be nigh impossible to mitigate against entirely (e.g. "cold boot attacks").

Having written as much, RCE are not a doomsday scenario. Such vulnerabilities and exploit conditions come up with some frequency. Patching, typically remediates them.

@GossiTheDog