This paper discusses the problems of information security definition - software-defined networking (SDN). Although the separation of control plane and data plane levels relieves a number of network security threats but they also change the capabilities of existing protection methods and new threats emerge in relation to a control loop. There are two main groups of tasks: the first is to provide data security in the SDN networking (data plane) and the second is due to the need to protect the control circuit (control plane). Moreover, the information security implementation affects the SDN-based development of virtualized network services (NFV).