A number of DSL home routers from a number of vendors contain hard-coded credentials that could allow a hacker to hijack the network devices via telnet services. The CERT at Carnegie Mellon University issued an advisory confirming the serious security issued in the home routers. All the devices analyzed by the researchers have the XXXXairocon as default telnet password, where the XXXX is the MAC address of the home router. The vulnerability was previously disclosed in VU#228886 and assigned CVE-2014-0329 for ZTE ZXV10.”]
Source: https://securityaffairs.co/wordpress/39631/hacking/cert-home-routers-issues.html