common.c in infosvr in ASUS WRT firmware 3.0.0.4.376_1071, 3.0.0.376.2524-g0013f52, and other versions, as used in RT-AC66U, RT-N66U, and other routers, does not properly check the MAC address for a request, which allows remote attackers to bypass authentication and execute arbitrary commands via a NET_CMD_ID_MANU_CMD packet to UDP port 9999. NOTE: this issue was incorrectly mapped to CVE-2014-10000, but that ID is invalid due to its use as an example of the 2014 CVE ID syntax change.
https://www.exploit-db.com/exploits/44524/
https://support.t-mobile.com/docs/DOC-21994
https://github.com/jduck/asus-cmd
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-9397