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Backdoors don't really matter since the cameras are isolated to local only, and can only talk to the NVR.
any vulnerability is a risk i want to avoid, hikvision as a security camera company doesn't care about security.
https://packetstormsecurity.com/files/166334/Hikvision-IP-Camera-Backdoor.html
But if they don't have access to Internet, as others have said, there's nothing a backdoor can do.
chances are you don't have NAC setup on your home network, and even if you do that can be bypassed. mitigating risk means you accept the least amount of it. a company that's comfortable with built-in backdoors is unacceptable.
https://learningnetwork.cisco.com/s/blogs/a0D3i000002SKPREA4/vlan1-and-vlan-hopping-attack
https://resources.infosecinstitute.com/topic/vlan-hacking/
First of all, I'm no cyber security expert. If the devices don't have access to Internet, how can they do a VLAN hopping? They're not "intelligent" devices that can act by their own.
About the first link, just avoiding Cisco switches seems to solve the problem (please correct me if I'm wrong). About the second link, I've got a question, is VLAN hopping a real threat, can it really happens nowadays?