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Dynamic Sensor hubs are little, minimal expense gadgets outfitted with climate sensors and radio for remote correspondence. These sensor hubs might comprise the organization for observing actual peculiarities. Such organization is called Remote Sensor Organization (WSN). Remote sensor network comprises of large number (102-106) of sensor hubs. Remote sensor organizations can be used in an expansive assortment of utilizations going from war zone observation in military, through far off persistent checking in medication to woodland fire location in natural applications. Greater part of WSN applications expectsome degree of safety at any rate. To accomplish the required level,secure and strong steering is important. Secure information transmissionis a basic issue for remote sensor organizations (WSNs). In a groupbased WSN (CWSN), each bunch has a pioneer sensor hub, viewed as bunch head (CH). A CH totals the information gathered by the leaf hubs(non-CH sensor hubs) in its group, and sends the conglomeration to the base station (BS). In this paper, we have reviewed different securityissues and their countermeasure to diminish these issues.