The Application Firewall in Apple Mac OS X 10.5.8 drops unspecified firewall rules after a reboot, which might allow remote attackers to bypass intended access restrictions via packet data, related to a "timing issue."
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-2791
http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html