ISaGRAF Workbench communicates with Rockwell Automation ISaGRAF Runtime Versions 4.x and 5.x using TCP/IP. This communication protocol provides various file system operations, as well as the uploading of applications. Data is transferred over this protocol unencrypted, which could allow a remote unauthenticated attacker to upload, read, and delete files.
https://www.cisa.gov/uscert/ics/advisories/icsa-20-280-01
https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1131699
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-159-04