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Nighthawk cm1100 has voltage coming out of cable line
I have had two CM1100 routers with the same issue. My cable line coming from my ISP keeps burning up and ISP says I have electrical issues (open neutral on my electrical) Electrician and electrical ut...
I still suspect the modem is just a bridge between the Ethernet ground and the coax shield/threads.
Unplug all connections to the modem and remove it completely.
Measure the AC voltage between the *cable* shield and a ground or chassis on the computer that the modem *was* connected to.
As previously stated the power adapter may have a few pF capacitance between AC line and its output. If all capacitances were symmetrical and your meter had infinite input impedance you would see half of your line voltage. Something less than that is normal. Regulatory agencies test that any leakage current is non-hazardous to humans in all conditions, let alone hazardous to grounding hardware.
Run your AC voltage test again with any normally functioning wall-warty supply in the house and you will get similar results. It means nothing in and of itself.