NIST SP 800-53 Rev. 5 CA-1 — Policy And Procedures

What this control requires

Develops, documents, and disseminates assessment, authorization, and monitoring policies and procedures, designating an official to manage and update them periodically. This control supports the Policy Management System capability within the Assessment, Authorization, and Monitoring family.

In plain English

Develops, documents, and disseminates assessment, authorization, and monitoring policies and procedures, designating an official to manage and update them periodically. In practice, this means you can prove you policy procedures-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 Assessment, Authorization, and Monitoring, the assessor will trace your implementation back to the catalogue reference (Control CA-1) 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.

Vulnerability Management

Scanners. Pair an unauthenticated scanner (Nessus / Qualys / Tenable.io) for external surface with an authenticated agent for OS/library CVEs on every host.

SLA. Document remediation SLAs by CVSS / EPSS: critical 7 days, high 30 days, medium 90 days; report monthly trend to leadership.

Containers. Scan images in CI (Trivy / Grype / Snyk Container) AND at runtime; block deploys on critical findings without exception.

Operational checklist

• Policy. 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.
• Authorization. Document the trigger, the owner and the cadence.
• Continuous. Document the trigger, the owner and the cadence.
• Scope: procedures, management, authorization, system, assessment, capability, documents, policy.

Evidence to collect

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

Signed policy or standard documents the safeguard. Focus: Policy And Procedures.

Common pitfalls

• Policies that no engineer has read; the version in Confluence drifts from the version that's actually being enforced.
• Scans that hit only the perimeter; missing authenticated scans of OS, runtime libs and base images so most CVEs are invisible.

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.

• CIS Controls v8 7.1 — Establish and Maintain a Vulnerability Management Process
• HIPAA (45 CFR Part 164) 164.308(a)(3)(ii)(A) — Workforce security - Authorization and/or Supervision
• NIST SP 800-171 Rev. 3 3.12.2 — Plan of Action and Milestones
• SOC 2 (2017 TSC) CC3.3 — Fraud Risk Assessment
• BSI C5:2020 OIS-05 — Contact with Relevant Government Agencies and Interest Groups

Related controls in NIST SP 800-53 Rev. 5

• Control CA-7(1) — Independent Assessment
• Control CA-5 — Plan Of Action And Milestones
• Control RA-5(2) — Update Vulnerabilities To Be Scanned
• Control CA-7(4) — Risk Monitoring
• Control CA-2 — Control Assessments
• Control CA-8(1) — Independent Penetration Testing Agent Or Team

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control CA-1

Topics: governance riskcontinuous monitoringpatch managementpolicy managementvulnerability management