Conexant ADSL Router Vulnerability

I remember back about 4 years ago when BT Wholesale ISP's were supplying contracted customers with Conexant routers with the CX82310 chip, now with any customer they are advised to change the default passwords to deny external access via telnet, what the customer nor the ISP's knew was that you could telnet on a high port number such as 2** and gain access without even offering a password, this only came to light several months or even a year after distribution and no doubt even now some customers are unaware of this, this security exploit basically gave anyone complete access to the router

quite serious stuff if the Router was part of a business network

in other words my advice is always spend time learning about your new router or modem as it could cost you your data