Lots of bugs aren't particularly exploitable. As Tavis notes, one of the major problems here is that there's a structure containing function pointers adjacent t

Lots of bugs aren't particularly exploitable. As Tavis notes, one of the major problems here is that there's a structure containing function pointers adjacent to the buffer. If all you have is a stack overflow you may have your work cut out for you. Further, while this bug may exist, assertions elsewhere could have meant it was unexploitable. So in isolation it's an overflow but in context it's not reachable. That didn't happen here. This happens a lot actually.