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[–] [deleted] ago 

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[–] uncle_bob ago 

It probably is flakey after 2 years without updated. Luckily it's not your problem. The firewall on the router should not trust anything from it, even if it was updated and more secure. If it's an approved, certified, or rented modem, it's the cable companies problem.

The firewall should block all private address from the modem, https://en.wikipedia.org/wiki/Private_network, and everything else is the hostile Internet. Everything from the modem is hostile, or wrong, or both.