Internet TCP port 502 is primarily used by the Modbus protocol, an application layer messaging protocol that provides client/server communication between devices connected on different types of buses or networks. Modbus is often used for transmitting signals from instrumentation and control devices back to a main controller or data gathering system, for example in industrial control systems. This protocol is commonly used in industries such as manufacturing, power generation, and process control. Therefore, any software or system that implements the Modbus protocol, such as SCADA systems, PLCs, and other industrial automation systems, would use TCP port 502.
TCP port 502 is commonly associated with the Modbus protocol, which is widely used in industrial control systems. In the past, hackers have exploited this port to launch cyber-attacks on critical infrastructure. For instance, the Stuxnet worm, which targeted Iranian nuclear facilities, exploited TCP port 502 to gain unauthorized access and disrupt operations. Additionally, the 2010 Ukrainian power grid attack was also linked to the exploitation of this port. Hackers often target this port due to the lack of built-in security in the Modbus protocol, making systems using this protocol vulnerable to attacks.
