http://forum.teamspeak.com/showthread.php/120755-SECURITY-UPDATE-TeamSpeak-3-Client-3-0-18-1-is-Available just might be worth looking into. more on comments.
"We still strongly recommend updating the minimum version requirement in your servers in order to force your users to upgrade their clients and ensure their security, but you might experience an increase in support inquiries from mobile users (primarily iOS users) in the next few days."
