Server hacking tools for Minecraft?

To find vulnerabilities on websites there are certain tools that automatically check for each parameter for sources of error such as SQL injections and so on.

Is there such a thing for Minecraft servers?

Something that automatically searches commands or packets for gaps?

Not that I know…

You would have to know about the weaknesses before I can look for them

Other than trying out the weak points directly with a hack client, I can't think of anything. There's always a functioning crash exploit as long as the server is not secured with plugins (mojang hardly does anything against it)