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The emergence and rapid growth of Internet of Things (IoT) with unlimited benefits, facilities and applications provided such as smart cities, smart home, intelligent transportation (ITS), smart health and smart grids impacts everyone's lives. However, IoT based systems and applications are vulnerable to various security threats and attacks due to their deployment and use of sensing devices. Moreover, the lack of standardization due to heterogeneity of devices and technologies implementing security in IoT is real challenge. The aim of this review paper is to highlight the various security threats, challenges and attacks faced by IoT enable applications.