Many, if not most, can not. Sometimes even if the user thinks they have. https://krebsonsecurity.com/2016/10/hacked-cameras-dvrs-powered-todays-massive-interne

Many, if not most, can not. Sometimes even if the user thinks they have. https://krebsonsecurity.com/2016/10/hacked-cameras-dvrs-powered-todays-massive-internet-outage/ https://krebsonsecurity.com/2016/10/hacked-cameras-dvrs-powe... 'That’s because while many of these devices allow users to change the default usernames and passwords on a Web-based administration panel that ships with the products, those machines can still be reached via more obscure, less user-friendly communications services called “Telnet” and “SSH.” ... “The issue with these particular devices is that a user cannot feasibly change this password,” Flashpoint’s Zach Wikholm told KrebsOnSecurity. “The password is hardcoded into the firmware, and the tools necessary to disable it are not present. Even worse, the web interface is not aware that these credentials even exist.”'