A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a possible denial of service when writing sensitive application variables to the controller over Modbus.
https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0770
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/