Hacking/Exploiting Minecraft Servers

Amongst the many great idea's and want's around the community here, had some question's related to the actual minecraft server and it's protocols as well as exploitation on the outside of the game. There are several minecraft server control panels/server panels. Most that are on dedicated server's use Multicraft or something of the like. Besides simple FTP exploitation on private servers or self-hosted server's I've had no luck in reverse engineering most of these server software's or at least finding an asm buffer exploitation that would allow me to execute shell code or arbitrary code. I have had some luck on the cracked server's were I am able to crash the server due to buffer overflow's to the 'set experience' buffer being managed only at sizeof(levelset). But nothing more, and even that is a hit and miss depending on the server controller/software and host. Has anyone been able to actually rev these control panels and are they exploitable (within reasonable means)?