Security cameras are supposed to offer security, not provide a window into your private life for anyone who has internet access to view.  For many cameras, no exploit or hacking is needed to view the surveillance footage.

Some businesses may not mind, but cameras that are not properly secured in homes allow for privacy invasions, and the potential for burglars or other criminals to find your address and already know who and what is inside.

If you're unsure about the security of your security camera, try doing a Google search for how to troubleshoot your specific model of security camera.  This will provide you with a good idea of any known flaws or access points that you may be able to take action on.

Aside from changing passwords, keeping your camera firmware up-to-date is another route to keeping your home or business privacy secure.