No device is 100 percent immune from vulnerabilities, but there are some simple, common-sense steps you can take to protect IP-based cameras. Dont put cameras on the public internet, avoid using routable IP addresses for IP cameras if at all possible. Instead, put cameras behind a firewall and run network address translation (NAT)NAT is not itself a security mechanism, but it will at least offer some protection from probes by scanning tools. The recent DDoS attacks on DNS infrastructure used botnets of public cameras, and all the attackers had to do was find the cameras.”]
Source: https://www.csoonline.com/article/3160167/6-steps-to-secure-a-home-security-camera.html