An Improper Input Validation issue was discovered in Rockwell Automation MicroLogix 1100 controllers 1763-L16BWA 1763-L16AWA 1763-L16BBB and 1763-L16DWD. A remote unauthenticated attacker could send a single specially crafted Programmable Controller Communication Commands (PCCC) packet to the controller that could potentially cause the controller to enter a DoS condition.