Network Function Virtualization (NFV) and Software Defined Network (SDN) have changed the networking industry dramatically. NFV virtualizes network services by utilizing virtualization technologies to reduce the dependency on underlying hardware. NFV provides many benefits such as faster service enablement, ease of resource management and lower OPEX and CAPEX. SDN separates the control functions from the underlying physical network by decoupling the control and data planes. SDN provides many benefits such as reduced costs, ease of deployment and management, better scalability, availability, flexibility and fine-grain control of traffic and security. Like traditional networks, they are subject to various security threats and attacks. In this workshop, we invite high-quality submissions in the areas of NFV and SDN security and other related areas. Submitted papers should highlight methods and approaches that can be used to analyse the security risks and requirements, threats and techniques related to NFV and SDN and to provide novel methods and approaches to assure security in NFV and SDN.