When we told you that Apple had released iOS 7.0.6 to the public yesterday, all we really knew about the update was that it fixed an SSL connection verification issue. We didn't know it at the time, but it turns out that this was actually a major security flaw in iOS 7.
In a support document, Apple noted that the patch repaired a specific vulnerability that could allow an attacker with a "privileged network position" to capture or modify data protected by SSL/TLS. In other words, iOS was vulnerable to a 'man-in-the-middle attack.'