I spent over a decade working on security cameras and various NVR related applications. Hard wired cameras are more secure, BUT, if someone can get access to your network cable, it's not hard to inject packets and DOS out most UDP-based cameras.
Most large sites put their cameras on segregated networks, so it might not even be obvious to folks for a while.
Most large sites put their cameras on segregated networks, so it might not even be obvious to folks for a while.