Apple has announced that there is a major security flaw in iOS and OS X last Friday, February 21st. The flaw allows emails and communications to be intercepted through means of a Man in the Middle Attack. Apple has released a patch for the current version of iOS for iPhones 4 and later along with 5th generation iPod touches and iPad2 and later; update your iOS immediately. While Apple is working on a patch for OS X, do not use untrusted wifi connections.
http://www.reuters.com/article/2014/02/22/us-apple-flaw-idUSBREA1L01Y20140222