Commonly existing PLC Supply Chain Threats: Multiple critical vulnerabilities in Codesys Runtime Abstract We conducted an in-depth research on CODESYS V2 runtime and PLCs using this kernel (ABB AC500 PLCs) We found 11 vulnerabilities in CODESYS V2 runtime; 2 of all accepted vulnerabilities graded as critical, 7 as high risk, and 2 as medium risk These vulnerabilities a