Ceragon FibeAir IP-10 have a default SSH public key in the authorized_keys file for the mateidu user, which allows remote attackers to obtain SSH access by leveraging knowledge of the private key.
https://gist.github.com/todb-r7/5d86ecc8118f9eeecc15
http://www.securityfocus.com/bid/73696
http://seclists.org/fulldisclosure/2015/Apr/3
http://packetstormsecurity.com/files/131259/Ceragon-FibeAir-IP-10-SSH-Private-Key-Exposure.html