Something odd happened during internet play today.

While in the middle of a Homeworlds game, network throughput started to sputter and my opponents started acting really strange. When it came to my turn, things became really difficult to control and my worm started acting on its own!

I had no problem leaving the game and I immediately closed off all ports.

Is there a known or suspected remote exploit for Worms 4 or Gamespy in general?

Most likely it was a network glitch. It's unlikely to be an exploit.

Yes, this happened to me some times. Maybe the servers didn't act perfectly.