"The vulnerability, disclosed on Monday, may be the worst one to date. It puts 95% of Android devices—950 million gadgets—at risk of being hacked"

On the face of it it sounds like all the other major bugs, but this one can be activated by simply receiving an MMS!

http://fortune.com/2015/07/28/stagefright-google-android-security/
http://fortune.com/2015/07/27/stagefright-android-vulnerability-text/

This should have everyone responsible for corporate data thinking about their mobile device management policy