Abstract: Wireless sensor networks are the widely used networks in case of research and persuasive computing. These networks consist of number of sensor nodes which collect data and send it to the data aggregator for further processing. The use of low powered and energy efficient devices for the collection of data is one of the requirements of these networks and thus energy management becomes an important part of them. One of the major issues related to security which is faced by these networks is that of vampire attacks. These attacks are launched by the adversaries in order to drain the energy from the network so as to create denial of services and abruption. This paper focuses on vampire attacks, their effects on wires less sensor networks and finally also discusses about the modified clean state sensor network routing protocol which is one of the promising work to resist and protect again the vampire attacks.