D-Link DIR-850L REV. B (with firmware through FW208WWb02) devices have a hardcoded password of wrgac25dlink.2013guidir850l for the Alphanetworks account upon device reset, which allows remote attackers to obtain root access via a TELNET session.
registersend.php on D-Link DIR-850L REV. B (with firmware through FW208WWb02) devices does not require authentication, which can result in unintended enrollment in mydlink Cloud Services.