DSL routers from a number of manufacturers contain hard-coded credentials that could allow a hacker to access the devices via telnet services and remotely control them.

An advisory published Tuesday by the DHS-sponsored CERT at the Software Engineering Institute at Carnegie Mellon University said the issues are still present in the routers and that organizations could write firewall rules that block telnet or SNMP on the device as a temporary mitigation. Telnet network services are used by some manufacturers for remote support.

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