As the latest technology, IoT is growing rapidly in the communications environment, enabling it to communicate with other devices such as sensors and radio frequency identification (RFID) devices. The purpose of this research is to provide an overview of cybersecurity that will form the basis for future technological developments. This research applied systematic mapping study as the methodological approach. Based on the chosen search strategy, 29 articles were selected for a closer examination. This research reveals cyber security attacks on the IoT, particularly RFID and WSN technologies, which are the basic technologies for the development of the IoT.  We found that RFID requires access control to prevent attackers from misusing information, and that key management must be compatible with WSN technology to predict attackers.