Why did someone CTCP VERSION me?

CTCP VERSION causes your IRC Client to return a client-name-and-version string to the requesting user. It's a service provided by your client which you can turn on and off. On many IRC clients, you can even set a false VERSION string. But the random person using the command on your client was probably just curious what IRC Client you're running.

The WyldRyde Network Staff often run network-wide CTCP VERSIONs to help us gage client usage and to find unauthorized bots and unauthorized clients.

Update your client regularly to avoid security problems, and don't be too worried unless they're doing more than just CTCP VERSION, or doing it over and over in a very short term.