Google still can not cope with Stagefright
Even if you have installed the update that addresses a Stagefright, it is not certain that your device is protected. The team of Excodus, who discovered this bug in the beginning, said he was able to send malicious mp4 video on a smartphone with installed update, which led to reboot.
From Google confirmed that the patch does not work in all cases and continue to work on a full solution. Many are surprised by the public nature of the discovery of Exodus, usually communicating a similar theme are kept closed between experts and the company within 90 days. From Exodus claim that they are not the only ones who are familiar with this bug and believe that some of the others can benefit from it with bad intentions.