The network interface for Apple AirPort Express 6.x before Firmware Update 6.3, and AirPort Extreme 5.x before Firmware Update 5.7, allows remote attackers to cause a denial of service (unresponsive interface) via malformed packets.
http://www.vupen.com/english/advisories/2006/0064
http://www.securityfocus.com/bid/16146
http://securitytracker.com/id?1015443
http://secunia.com/advisories/18319
http://lists.apple.com/archives/security-announce/2006/Jan/msg00000.html