First, upgrade to 2.03 ASAP.
You might also want to use .htaccess to p/w protect the admin directory to also give you a second layer of defense.
That being said, I haven't heard of any confirmed hacking cases with 2.03.
Keep in mind if you're on a shared host, your forums will be vulnerable to hacking attempts from others on your shared host.
This is normally done via telnet and pretty much all the major forums (phpBB, Invisionboard, vBulletin) suffer from this as it is a weakness in the server configuration, not the script.