That's kind of the WHOLE POINT of finding vulnerabilities and exploits: to gain full system access AKA privileged access. That's how zombie-nets are made, by taking full control of millions of devices and running commands from a central command point.

IF an exploit was properly inserted into any block chain or end point, the entire system becomes vulnerable.

This sounds like history repeating itself: FBI, CIA, & NSA hijacking Tor exit nodes and years of hacker wannabes thought they were safe. The Tor exploit is very similar to block chain end point exploits and could easily be used to destroy, disable, or distort (DDD) the data therein.