Worth noting: while taking code written for 32-bits and migrating it to a 64-bit environment can accidentally introduce new vulnerabilities, it is ALSO possible

Worth noting: while taking code written for 32-bits and migrating it to a 64-bit environment can accidentally introduce new vulnerabilities, it is ALSO possible for the opposite to happen. That is, you can take code written for a 32-bit environment and compile it for a 64-bit environment thus FIXING some vulnerabilities: probably ones you didn't even know about. Given how common buffer-overrun vulnerabilities are in 32-bit code, I wouldn't even be surprised if it is more common to increase safety than decrease it.