Technically, even if find weakness, I doubt if you can exploit it because technology will always advance and the chain keeps increasing. While you try to find a weakness in point A, point B will definitely block such flaws.
It depends on the weakness. The point @ETFbitcoin is making about weakness in RNG is about examples such as the blockchain.info wallet that used the same k for every signature and led to some funds being lost. This has nothing to do with technology, it is simply flawed implementation due to incompetency of those developers (they were stupidly using random.org website!).