The Networking subsystem in Apple iPod touch 2.0 through 2.0.2, and iPhone 2.0 through 2.0.2, uses predictable TCP initial sequence numbers, which allows remote attackers to spoof or hijack a TCP connection.
http://support.apple.com/kb/HT3129
http://support.apple.com/kb/HT3026
http://lists.apple.com/archives/security-announce//2008/Sep/msg00004.html
http://lists.apple.com/archives/security-announce//2008/Sep/msg00003.html