Zitat:If you are running an OpenTTD server, which is version 0.4.0.1 (and not the Gentoo patched version), then yes, it is possible (and rather easy) to crash the game server (not the machine, just the program). It could also be possible to run code on the system as the user who is running the server, but this is unlikely, and depends on your operating system.

This issue was fixed in revision 2899, so if you are playing a nightly you will be safe. I also do not believe there is any security risk to the client if using the 0.4.0.1 release, but if you are extra paranoid you may want to upgrade.