NIST SP 800-53 Rev. 5 SA-8(25) — Economic Security

What this control requires

Implement economic security by ensuring security mechanisms are cost-effective relative to potential breach impact. Apply cost-benefit analysis to calibrate mechanism strength and assurance efforts based on actual risk and trustworthiness needs. This control supports the Cost-Benefit Analysis Engine capability within the System and Services Acquisition family.

In plain English

Implement economic security by ensuring security mechanisms are cost-effective relative to potential breach impact. 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.

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 System and Services Acquisition, the assessor will trace your implementation back to the catalogue reference (Control SA-8(25)) and look for objective evidence on the latest two assessment cycles.

How to implement

Incident Response

Runbook. Maintain a runbook keyed by incident type with named roles (IC, comms, scribe), an out-of-band comms channel, and a 72-hour timeline for external notification.

Tabletop. Run a quarterly tabletop exercise (ransomware, insider, supply-chain) and feed gaps back into the runbook.

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.
• Security. Document the trigger, the owner and the cadence.
• Response. Document the trigger, the owner and the cadence.
• System. Document the trigger, the owner and the cadence.
• Control. Document the trigger, the owner and the cadence.
• Scope: management, system, analysis, services, capability, security mechanisms, implement, policy.

Evidence to collect

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

Signed policy or standard documents the safeguard. Focus: Economic Security.

Common pitfalls

• Runbooks that name a role but no person, or list a paging channel that no longer exists.
• 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 3.3.5 — Audit Record Review, Analysis, and Reporting
• HIPAA (45 CFR Part 164) 164.308(a)(5)(i) — Security Awareness and Training
• BSI C5:2020 SP-01 — Documentation, communication and provision of policies and instructions
• ISO/IEC 27001:2022 A.5.21 — Managing information security in the ICT supply chain

Related controls in NIST SP 800-53 Rev. 5

• Control SA-8(4) — Partially Ordered Dependencies
• Control SA-8(17) — Secure Distributed Composition
• Control SA-17(4) — Informal Correspondence
• Control SA-18 — Tamper Resistance And Detection
• Control SA-8(10) — Hierarchical Trust
• Control SA-17(3) — Formal Correspondence

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control SA-8(25)

Topics: governance riskincident responsepolicy management