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IndustriAgents/S7comm-MCP
Read-only-by-default MCP server for Siemens S7-300/400/1200/1500 PLCs over S7comm.
Score56%
Unknown4/12
TypeOpen source
Last checked2026-10-16
12-point checklist
| # | Criterion | CISA | Score | Evidence |
|---|---|---|---|---|
| C1 | Actuation capability 2 pts if: Cannot write/actuate, or writes are clearly isolated | P2, P4 | writes possible once enabled; CPU RUN/STOP needs a second switch | |
| C2 | Read-only by default 2 pts if: Write/method tools off unless explicitly enabled | P4 | write tools refuse unless S7_WRITES_ENABLED=true | |
| C3 | Write guardrails 2 pts if: Per-tag allowlist plus value/rate limits or interlock checks | P4 | batch writes validated before sending; inputs never written; no value ranges documented | |
| C4 | Human-in-the-loop approval 2 pts if: Critical writes need explicit human confirmation | P4 | Not documented publicly / not yet verified | |
| C5 | Authentication 2 pts if: Authenticated sessions to the OT endpoint; no anonymous default | P3, P4 | S7comm has no authentication (README) | |
| C6 | Encryption & cert verification 2 pts if: Encrypted transport with server certificate verification | P4 | S7comm has no encryption (README) | |
| C7 | Audit logging 2 pts if: Every agent call/write logged durably | P3, P4 | Not documented publicly / not yet verified | |
| C8 | Network placement 2 pts if: On-prem/edge/air-gapped or push/DMZ flow; no inbound IT→OT path | P2, P4 | Not documented publicly / not yet verified | |
| C9 | Data leaving the site 2 pts if: No telemetry; plant data can stay on-prem | P2 | Not documented publicly / not yet verified | |
| C10 | Fail-safe & safety independence 2 pts if: Fails closed; safety systems stay independent | P4 | writes sent at most once; overall per-request deadline | |
| C11 | Vendor security disclosure 2 pts if: Published security policy / PSIRT | P3 | SECURITY.md published | |
| C12 | Supply-chain hygiene 2 pts if: Versioned/signed releases; pinned installs | P3 | versioned PyPI/npm release 0.3.0; committed uv.lock |
Sources
- https://github.com/IndustriAgents/S7comm-MCP
- CISA et al., Principles for the Secure Integration of AI in OT (Dec 2025)
Note: Early stage; tested against a bundled mock CPU, not yet a range of real CPUs. Sources: README, SECURITY.md, PyPI industriagents-s7comm-mcp 0.3.0