Active Networks (ANs) are novel approaches to providing flexibility in the both network and service. ANs are realized with deployment of active nodes over network. For composing an active node, new components are required but may invite potential vulnerabilities. Many network-based attacks using vulnerabilities of new components can easily spread over network, because of the mobility of active packets. In order to prevent those attacks at the early stages, vulnerability assessment model for active networks is required. Because existing vulnerability models have limitations to be applied in ANs, we propose the Scalable Vulnerability Assessment Model (SVAM) that can efficiently manage vulnerable nodes in ANs. This approach provides good scalability by distributed vulnerability scanning mechanism based on policy and fast adaptability by automated deployment of new vulnerability scanning code.