NIST SP 800-53 Rev. 5 CM-9 — Configuration Management Plan

What this control requires

Develop and implement a configuration management plan defining roles, responsibilities, processes, and configuration item management. Ensure plan approval and protection from unauthorized access. This control supports the Planning capability within the Configuration Management family.

In plain English

Develop and implement a configuration management plan defining roles, responsibilities, processes, and configuration item management. 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 high. Auditors expect a named owner, a remediation SLA, and a tooling artefact that evidences continuous operation.

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 Configuration Management, the assessor will trace your implementation back to the catalogue reference (Control CM-9) and look for objective evidence on the latest two assessment cycles.

How to implement

Configuration Management

Policy-as-code. Codify the control as Service Control Policies (AWS), Azure Policy initiatives, or Organisation Policy (GCP) so the platform enforces what the document promises.

IaC. Gate Terraform / Pulumi / CloudFormation changes with Checkov / tfsec / OPA so misconfigurations never reach production.

Drift. Run a CSPM (Wiz / Prisma / Defender for Cloud / Security Command Center) over every account and route findings to a single risk register.

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.
• Access. Document the trigger, the owner and the cadence.
• Configuration. Document the trigger, the owner and the cadence.
• Protection. Document the trigger, the owner and the cadence.
• Unauthorized. Document the trigger, the owner and the cadence.
• Scope: management, protection, configuration, management plan, capability, implement, policy, roles.

Evidence to collect

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

Signed policy or standard documents the safeguard. Focus: Configuration Management Plan.

Common pitfalls

• Manual cloud-console changes that never make it back to Terraform — drift accumulates until the next outage forces a reconciliation.
• 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.

• BSI C5:2020 AM-02 — Acceptable Use and Safe Handling of Assets Policy
• NIST SP 800-171 Rev. 3 3.4.8 — Authorized Software - Allow by Exception
• HIPAA (45 CFR Part 164) 164.308(a)(7)(ii)(A) — Contingency Plan - Data Backup Plan
• ISO/IEC 27001:2022 A.5.5 — Contact with authorities
• SOC 2 (2017 TSC) CC2.3 — External Communication on Internal Control Matters

Related controls in NIST SP 800-53 Rev. 5

• Control CM-1 — Policy And Procedures
• Control CM-9(1) — Assignment Of Responsibility
• Control CM-11 — User-Installed Software
• Control CM-3 — Configuration Change Control
• Control CM-3(3) — Automated Change Implementation
• Control CP-1 — Policy And Procedures

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control CM-9

Topics: governance riskconfiguration managementpolicy management