I'd imagine this set is very similar to just "the set of software on the world". Even before the AI stuff, it was a pretty good bet at any given software had some vulnerability; it was just a question of how easy to was to find it.
So much out of date software with known exploits left running for years. The only reason there hasn't been total disaster is no one has tried to hack it yet.
The root problem is the world runs on C code that is riddled with vulnerabilities.