AI-Generated Scripts Now Targeting Siemens S7 PLCs at US Water Plants, Power Facilities, and Chemical Sites — NSA, CISA, FBI, DOE, EPA Joint Advisory AA26-231A: “This Is Not a Theoretical Risk — It Is an Active Threat”
Five US agencies — NSA, CISA, FBI, DOE, EPA — jointly confirmed August 19 that threat actors are using AI-generated exploitation scripts to attack Siemens S7 Series PLCs managing US water treatment, energy, manufacturing, and chemical infrastructure. The first government CSA to explicitly confirm AI-generated code targeting OT systems. Scripts use open-source snap7/python-snap7 libraries combined with AI coding assistants, disguised as legitimate OT monitoring tools, providing read/write access to PLC memory, configuration data, and ladder logic. Minnesota: 30+ community water systems disrupted July 26-27, one city plant shut down, safety alarms disabled. At least 12 US states confirmed. Iranian nexus suspected. Take internet-exposed S7 PLCs offline immediately.
