As usual... You will lose all your iMessages if you get hit by this, meaning starting afresh.
That's more than a nuisance. Its actual dataloss.
Compare it to the storm in a teacup that was android stagefright, which despite all the noise was never successfully executed in the wild, it's clear to see that this isn't a level playing field.
There are a few deserving bellends I know with iPhones that think everything apple does is wonderful, so they all got some texts from an online web based SMS service yesterday :-)
Plenty of mirrors, make sure you're is still live before sending to deserving recipient.