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This vulnerability was really hard to accomplish. It was not something your average hacker had the equipment to be able to do:
"Messages sent via iMessage are vulnerable to interception by a fake Apple server. Using such a server, the researchers repeatedly sent a single photo between iOS devices, subtly making minor changes to the photo each time and checking to see how that affected the encrypted version. After thousands of tries, they finally deduced the 128-bit encryption key.The team's original attack require targeted devices to not be updated to the most recent version of iOS (by implication, any version of iOS 9), but a modified version of the attack could affect even iPhones fully patched through yesterday.
The vulnerability was closed with yesterday's update to iOS 9.3.