NIST SP 800-53 Rev. 5·Control SI-2·critical·Component: System and Information Integrity

What this control requires

Identify, report, and correct system flaws. Test software and firmware updates related to flaw remediation for effectiveness and potential side effects before installation. Install security-relevant software and firmware updates within a defined time period of release. Incorporate flaw remediation into the organization's configuration management process to ensure proper tracking and verification. This control supports the System Integrity Controls capability within the System and Information Integrity family.
— NIST SP 800-53 Rev. 5, Control SI-2

In plain English

Identify, report, and correct system flaws. 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 System and Information Integrity, the assessor will trace your implementation back to the catalogue reference (Control SI-2) and look for objective evidence on the latest two assessment cycles.

How to implement

Code Review Testing

Pipeline. Require at least one human reviewer plus passing CI (lint, type, unit, security scan) before merge — protected branches enforce this.

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.
  • Security-Relevant. Document the trigger, the owner and the cadence.
  • Information. Document the trigger, the owner and the cadence.
  • Process. Document the trigger, the owner and the cadence.
  • Configuration. Document the trigger, the owner and the cadence.
  • Scope: management, information, release, organization, system, controls, time, configuration.

Evidence to collect

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

Signed policy or standard documents the safeguard. Focus: Flaw Remediation.

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.

Related controls in NIST SP 800-53 Rev. 5

References

Topics: governance riskcode review testingconfiguration managementpolicy management