Cloud computing, near-field communication, wireless cellular networks, etc. are only a few of the associated technological advancements that have gained widespread market adoption in relation to the Internet of Things. Therefore, from an IoT viewpoint, it is crucial to pay attention to its applicability and feasibility features in connection to pertinent security concerns. This paper’s goal is to analyse and illustrate how security issues with wireless sensor networks affect the Internet of Things and its applications. As a result, this publication offers an overview of the major and secondary security requirements for wireless sensor networks together with a taxonomy of potential threats and attacks against these requirements. Despite recent advancements in WSN technology, the application still confronts major difficulties because these sensors are often put in remote places. The main issues here include risks to network security, network architecture, data collecting and deployment, and network coverage. These five subjects have so been extensively researched in the literature. This paper’s major goal is to thoroughly discuss these challenges and proposed model with solution (Contiki Cooja) also discussed in details