Most of the DSL modem and Wifi Routers are vulnerable because the configuration file can easily be downloaded and decompressed to get sensitive data like admin page login details.
so, hackers can bypass their malicious traffic through your network.
Remote Access on Modem can be disabled to protect it from being accessed via wan.
Some modem might not give access to their configuration file.
in that case Hydra can be used for cracking..
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