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NIST SP 800-172 Enhanced CUI Protection Center

03.04.06E — Retention of Previous Configurations

Read the official CUI requirement and assessment content, then use the separately labeled Bare Metal Cyber perspective to connect it to implementation, evidence, and sustained operation.

1Parameters
1Source controls
1Assessment objectives
3Assessment methods

03.04 — Configuration Management · NIST SP 800-172 Revision 3

Active
Official NIST requirement content

Security requirement

Retain [Organization-defined: number] previous versions of baseline configurations of the system to support rollback.

Official NIST discussion

Discussion

Retaining previous versions of baseline configurations to support rollback includes configuration files for hardware, software, and firmware, configuration records, and associated documentation. This requirement enhances SP 800-171 requirement 03.04.01.

Official organization-defined parameters

Tailoring decisions required

Resolve these values through the governing organization’s approved tailoring and risk-management process before declaring the requirement implemented.

numberorganization-defined numberthe number of previous baseline configuration versions to be retained is defined.
Official protection strategy classifications

Protection strategies supported

These classifications are carried from the official SP 800-172 OSCAL record and help explain the enhanced requirement’s defensive purpose.

PS-CRSCyber Resiliency
PS-DLODamage-Limiting Operations
Bare Metal Cyber interpretation

Implementation perspective

Treat Retention of Previous Configurations as an enhanced CUI protection outcome for elevated threat conditions that must be reflected in the system boundary, documented implementation, operational behavior, and assessment evidence. Pay particular attention to approved baselines, secure configuration, change control, inventories, and drift management within the CUI boundary.

  1. Confirm the federal agency selected this enhanced requirement for the critical program or high-value asset and identify the CUI system components, services, users, and external connections in scope.
  2. Resolve every organization-defined parameter through an approved governance and tailoring process.
  3. Map each clause of the requirement to an accountable owner, implementation mechanism, and evidence source.
  4. Verify that inherited and shared implementations are supported by current provider evidence and responsibility boundaries.
  5. Collect evidence during normal operation and review changes, exceptions, and deficiencies on a risk-based cadence.

Questions to ask

  • Which critical-program or high-value-asset CUI, data flows, users, and services are protected by this enhanced requirement?
  • Which portions are implemented locally, inherited, shared, or not applicable, and what evidence supports that determination?
  • Do the system security plan, deployed configuration, operating process, and assessment evidence tell the same story?
  • What change, incident, or threshold should trigger reassessment?

Evidence and validation

  • approved baseline configurations
  • change tickets and approvals
  • configuration scan and drift reports
  • software and hardware inventories

Common failure patterns

  • baselines documented but not enforced
  • emergency changes never reconciled
  • cloud or ephemeral assets missing from inventory
  • security impact analysis performed after deployment
Official NIST SP 800-172A content

Assessment objectives and methods

Assessment objectives (1)

  1. [Organization-defined: number] previous versions of baseline configurations of the system are retained to support rollback.

Examine

  • Configuration management policy
  • procedures addressing the baseline configuration of the system
  • configuration management plan
  • system architecture and configuration documentation
  • system configuration settings and associated documentation
  • copies of previous baseline configuration versions
  • system security plan
  • other relevant documents or records

Interview

  • Personnel with configuration management responsibilities
  • personnel with information security responsibilities
  • system/network administrators

Test

  • Processes for managing baseline configurations
Official source-control relationships

Source NIST SP 800-53 controls

These controls are referenced by the official SP 800-172 Rev. 3 OSCAL record. Open the corresponding control pages for complete control text, enhancements, D3FEND mappings, and related learning.

Source controlCM-2(3)Open SP 800-53 control →
Source record

Authoritative sources

Bare Metal Cyber is an independent educational publisher and is not affiliated with or endorsed by NIST. The official publications, the responsible federal agency, and the governing contract or agreement determine applicability, tailoring, assessment depth, and required implementation.