Please update iOS on your iPhone or iPad as soon as possible, if you haven't done so already. On Friday, Apple released iOS 7.0.6 to fix a flaw that had been discovered. And according to this article on Wired, it's very serious. It's simply a typo in the code, an extra GoTo statement, that would allow hackers to bypass authentication procedures on your device and intercept email and other communications that should have been encrypted.
According to ZDNet, "Make no mistake about it, this is a very serious bug. The bug makes it fairly straightforward to intercept and decrypt SSL/TLS communications, probably the most important security protocol there is today."