COPA-DATA zenon DNP3 NG driver (DNP3 master) 7.10 and 7.11 through 7.11 SP0 build 10238 and zenon DNP3 Process Gateway (DNP3 outstation) 7.11 SP0 build 10238 and earlier allow remote attackers to cause a denial of service (infinite loop and process crash) by sending a crafted DNP3 packet over TCP.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.