NIST SP 800-53 Rev. 5 PE-21 — Electromagnetic Pulse Protection

What this control requires

This control mandates the implementation of organization-defined protective measures against electromagnetic pulse (EMP) damage for critical systems and components. EMP, whether natural or man-made, can disrupt or damage electronic equipment, necessitating protective solutions like shielding, surge suppressors, and grounding. This control supports the EMP Shielding System capability within the Physical and Environmental Protection family.

In plain English

This control mandates the implementation of organization-defined protective measures against electromagnetic pulse (EMP) damage for critical systems and components. In practice, this means you can prove you policy management-level controls on a defined cadence.

Why it matters

SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed.

This control is rated critical in the source catalogue. Treat gaps here as production incidents in the risk register, not housekeeping.

What an auditor looks for

A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan.

Within Physical and Environmental Protection, the assessor will trace your implementation back to the catalogue reference (Control PE-21) and look for objective evidence on the latest two assessment cycles.

How to implement

Policy Management

Docs. Keep each policy in version-controlled Markdown alongside the code that implements it; ship a signed PDF snapshot at each annual review and link the SHA into the SoA.

Operational checklist

• Policy. Document the trigger, the owner and the cadence.
• Physical. Document the trigger, the owner and the cadence.
• Protection. Document the trigger, the owner and the cadence.
• Environmental. Document the trigger, the owner and the cadence.
• System. Document the trigger, the owner and the cadence.
• Scope: management, organization, system, solutions, protection, components, capability, systems.

Evidence to collect

• Policy Document. A signed and version-controlled policy / standard / procedure document.

Signed policy or standard documents the safeguard. Focus: Electromagnetic Pulse Protection.

Common pitfalls

• Policies that no engineer has read; the version in Confluence drifts from the version that's actually being enforced.

How it maps to other frameworks

Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit.

• NIST SP 800-171 Rev. 3 3.4.11 — Information Location
• HIPAA (45 CFR Part 164) 164.308(a)(5)(i) — Security Awareness and Training
• BSI C5:2020 AM-02 — Acceptable Use and Safe Handling of Assets Policy

Related controls in NIST SP 800-53 Rev. 5

• Control PE-13(3) — Automatic Fire Suppression
• Control SC-36(2) — Synchronization
• Control SC-15(4) — Explicitly Indicate Current Participants
• Control SA-8(12) — Hierarchical Protection
• Control SA-17(8) — Orchestration
• Control SC-7(20) — Dynamic Isolation And Segregation

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control PE-21

Topics: governance riskpolicy management