<p>Developing a dynamic security control method is the aim of this research for cyber-physical systems (CPS) that are vulnerable to denial-of-service (DoS) assaults. DoS assaults were found in the channels connecting the controller to the actuator and the controller to the sensor. Thus, to protect against the assault in both channels, a dynamic security management system is required. To guarantee the control inputs regularly, the expected model uses time-based estimates and intermediate variables. Furthermore, a unique security model known as certainty-based detection model is used to control both the current and future control units are also modelled. By utilizing a unique estimator model and dynamic security control unit, the CPS can stabilize and effectively manage DoS attack without compromising controller performance. Based on the study and experimentation carried out in the MATLAB 2020a environment, it has been established that the expected model performs well in the CPS environment to efficiently manage DoS attacks.</p>