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Re:ARRIS Cable Modem Has a Backdoor in the Backdoor by Nacraile on Thursday November 19, 2015 @02:30PM (#10596958)
"Shodan searches indicate that the backdoor affects over 600.000 externally accessible hosts"

It doesn't look like this is LAN-only.

Even if it were, an escalation from unprivileged code execution on a single device to MITM any connection out of a network hardly seems "low priority".

Re:ARRIS Cable Modem Has a Backdoor in the Backdoor by johncolanduoni on Thursday November 19, 2015 @10:19PM (#10599374)
I'm guessing they used Shodan to locate the models they knew were affected (i.e. by model numbers), not to try the backdoor on unsuspecting devices (which would be illegal).