Using Reaver you can crack the WPA2 key with the first WPS pin reaver sends to the router, i.e. pin 12345670. Credit goes to zerodegrekelvin of SNB forums. Very easy to crack, just change any preshared key, Apply the change and go to reaver, it will succeed on the first attempt as reaver used pin 12345670 as the first pin!! So everytime you change the key, you are vulnerable! More info about it here: http://www.snbforums.com/threads/asus-rt-ac87u-wpa2-key-cracked-in-2-seconds.24217/ Video Tutorial: YouTube VideoWatch this video on YouTube.
The RT-AC52U what i purchased this year (2015), The default WPS is 09903814 so not all ASUS have 12345670