Calm down there buddy, your CS 101 class made you a bit too cocky.

That exploit you linked is almost 2 years ago, and fixed long ago. You mentioned that buffer overflows is what bade flash insecure? That's just factually wrong, buffer overflows is a small minority of the exploits that make Flash a piece of shit, these are the code execution exploits for Flash.

Are some of them overflows? Yes, are some of said overflows buffer overflows? Yes, is it a minority? Yes, are buffer overflows the primary reason Flash is insecure? No.

The way the game is crashed most likely doesn't contain a buffer overflow, and it just uses some sort of infinite loop, chances are a custom game mode doesn't have permission to write outside of it's buffer at all, if it even has permission to write it's own data itself.