Hi Qaswar ,
They don't have one. For RVC2 devices (all current cameras), you'd need to make sure that the LAN they are operating in is secure - if someone has access to it, they can eg. flash a new pipeline to the device.
That said, because Script node supports networking protocols (tcp/udp/http...) you could implement such username/password restriction to limit the retrieval of information from the camera.
You have video/NN result TCP streaming implemented, and you could require the client to first send some login info before you start streaming via TCP to it. You could save credentials on eg. eMMC/SD card (SD card custom branch example), then read them from Script node to check whether they are correct.