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asqi-carter/lgx-mcp
MCP server that stages online rung edits in Logix Designer and reads live Logix tags over CIP.
Score88%
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 | online rung edits and writes to designated command tags; no force tool | |
| C2 | Read-only by default 2 pts if: Write/method tools off unless explicitly enabled | P4 | live writes, Studio test/assemble and download are off by default | |
| C3 | Write guardrails 2 pts if: Per-tag allowlist plus value/rate limits or interlock checks | P4 | only designated command tags pass; Safety_, external-access-restricted and consumed tags denied; interlock check tool | |
| C4 | Human-in-the-loop approval 2 pts if: Critical writes need explicit human confirmation | P4 | per-call confirmation for publishing by default, but the server cannot verify it | |
| C5 | Authentication 2 pts if: Authenticated sessions to the OT endpoint; no anonymous default | P3, P4 | Not documented publicly / not yet verified | |
| C6 | Encryption & cert verification 2 pts if: Encrypted transport with server certificate verification | P4 | Not documented publicly / not yet verified | |
| C7 | Audit logging 2 pts if: Every agent call/write logged durably | P3, P4 | gate decisions, writes and connects appended to a local audit log | |
| C8 | Network placement 2 pts if: On-prem/edge/air-gapped or push/DMZ flow; no inbound IT→OT path | P2, P4 | local server on the engineering workstation; not remote access | |
| 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 | Safety_ tags denied; states it is not a safety system | |
| C11 | Vendor security disclosure 2 pts if: Published security policy / PSIRT | P3 | SECURITY.md and a security reporting address | |
| C12 | Supply-chain hygiene 2 pts if: Versioned/signed releases; pinned installs | P3 | Not documented publicly / not yet verified |
Sources
- https://asqi.org/resources/lgx-mcp-v1/
- https://github.com/asqi-carter/lgx-mcp
- CISA et al., Principles for the Secure Integration of AI in OT (Dec 2025)
Note: MIT. Verified only on FactoryTalk Logix Echo (emulator), not a physical controller. Approval confirmations rely on the MCP client. SECURITY.md