Apple Patches AirPort Weaknesses
Apple released security updates for Mac OS X 10.3 (Panther) and 10.4 (Tiger) that fix the AirPort Card weakness: While there was no widespread (or even narrowly spread) information about this exploit in the original AirPort Card's drivers being taken advantage of in the wild, Apple has patched the flaw within a few weeks of its announcement. The flaw would allow a nearby attacker to crash a Mac with an AirPort Card under the right circumstances (see previous post for more details).
Security Update 2006-007 has six different versions, but the AirPort Card was only ever available for PowerPC computers--Mac models released between 1999 and 2002 could accept the card--but Intel-based Macs include fixes to other bugs and weaknesses in this package. The security update is available in client and server flavors to patch 10.3.9 and 10.4.8.
You can download the patches manually or simply use Software Update from the Apple menu to get the appropriate release for your system.