If you see an email from NetSuite trying to scare you about C++ and security and Dynamics GP, please consider this:
GP is NOT a web-facing application. If a hacker is hacking GP they are already inside your system. If they are inside your system you have much bigger problems than some theoretical development language security issues. If a hacker is inside your system they are not going after GP, they’re going after your SQL database, emails, files, etc.
Are you concerned that a burglar can look in your medicine cabinet or are you concerned that they’re getting through your front door?