Modbus TCP attack — port 502 enumeration, coil/holding-register read/write without auth, function-code abuse (FC8 diagnostic, FC43 read-device-id), Modbus-over-Serial via TCP gateway, write-with-no-confirm DoS, value tampering against PLCs.
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tessl review fix ./packages/decepticon/decepticon/skills/standard/exploit/ics-ot/modbus/SKILL.mdSecurity
1 critical severity finding. Installing this skill is not recommended: please review these findings carefully if you do intend to do so.
Detected high-risk code patterns in the skill content — including its prompts, tool definitions, and resources — such as data exfiltration, backdoors, remote code execution, credential theft, system compromise, supply chain attacks, and obfuscation techniques.
The document is an explicit how-to guide for discovering, reading, tampering with, and denying service to Modbus PLCs — it contains step-by-step attack instructions enabling unauthorized control of industrial devices.
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