The WifiPasswordController generateDefaultPassword method in Preferences in Apple iOS 6 and earlier relies on the UITextChecker suggestWordInLanguage method for selection of Wi-Fi hotspot WPA2 PSK passphrases, which makes it easier for remote attackers to obtain access via a brute-force attack that leverages the insufficient number of possible passphrases.
http://www1.cs.fau.de/filepool/projects/hotspot/hotspot.pdf
http://www.securitytracker.com/id/1029054
http://support.apple.com/kb/HT5934
http://secunia.com/advisories/54886
http://lists.owasp.org/pipermail/owasp-mobile-security-project/2013-June/000640.html
http://lists.apple.com/archives/security-announce/2013/Sep/msg00006.html