You know what really grinds my gears? The fact that on my newish surfboard modem, when I looked around for a new firmware version, low and behold, apparently Arris/Motorola refuse to release the firmware to the consumer/owner of the device, and say that it is the ISP's responsibility to update firmware! No it's not, it's my hardware! I understand the docsis 3.0 spec says otherwise, but I disagree with it. So I call my ISP (Suddenlink), and lo and behold, they say it's not supported and therefore won't update my firmware. Now I find out it's probably backdoored!

You know, when the NSA and everyone else start talking about cybersecurity, I don't fucking beleive a word of it anymore, because if they were really concerned about security, they would be pushing for open source firmware modems, and would be letting these companies know about the vulns and pushing them to close them. Instead they sit on the 0-days like a treasure trove of new weapons. If you can figure out how to flash your CM on your own, it will still be overwritten with the firmware that gets pushed from your provider Not if you also figure out how to disable the firmware update feature, which I'd guess - I've never done anything with CMs other than plugging them in - is also code in the firmware itself. As long as the firmware running on the CM has full control of the hardware, it can be 'configured' to refuse such updates, and maybe even spoof the fact that it was updated successfully. (Unless there's also some remote-attestation type stuff happening too. I'm not sure, I don't work in this area.).

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It makes a little more sense once you look at the infrastructure that it's running on. You and ~500 of your neighbors are all on one local node that shares bandwidth between everyone. The way it works for upload is that your cable modem sends a request for an upload timeslot on a shared upload channel, then the CMTS which serves thousands upon thousands of people sends back your time slot when your modem is clear to use the upload channel.

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If anything goes screwy on your node such as significant interference or if your cable modem somehow hung up and was constantly sending on the upload channel outside of its time slot this means that absolutely everyone on the same node looses service. Not only can it affect a ton of customers all at once, your ISP doesn't have a good way of tracking down interference at a finer granularity than the node level which isn't a lot to go off of. They literally have to do a binary search by disconnecting sections of the local node and seeing what segment the interference is coming from. I've heard horror stories about interference coming from things like washing machines, treadmills, etc and being very intermittent and nearly impossible to find because of it. For the treadmill story, a whole node of customers would loose service for 15 minutes every couple of nights and whenever the ISP would get a technician out to start trying to isolate it, they'd already be off the treadmill and the problem would be over. Supposedly it took a while of having a tech in the area around when it normally started to track down which house it was coming from.