# NIST SP 800-171 Rev. 3 3.7.4 — Maintenance Tools - Source: https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-7-4-maintenance-tools - Section: [Compliance](https://support.icompaas.com/compliance) › [NIST SP 800-171 Rev. 3 Requirements](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3) › Maintenance — §3.7 - Last updated: 2026-06-05 - Publisher: iCompaas, Inc. (https://www.icompaas.com) **NIST SP 800-171 Rev. 3**·Requirement `3.7.4`·high·Component: **Maintenance** ## What this control requires > This control ensures that the use of system Maintenance tools is approved, controlled, and monitored. It requires checking diagnostic and test media for malicious code before use and prevents the removal of Maintenance equipment containing Controlled Unclassified Information (CUI) by sanitizing or retaining it within the facility. This control supports the Maintenance Tool Management capability within the Maintenance (3.7) family. > > — NIST SP 800-171 Rev. 3, Requirement 3.7.4 ### In plain English This control ensures that the use of system Maintenance tools is approved, controlled, and monitored. In practice, this means you can prove you information management-level controls on a defined cadence. ## Why it matters DoD contractors and their subcontractors must implement all 100 SP 800-171 requirements to keep CUI handling contracts. Gaps are scored against the SPRS scoring methodology; below a 110-point starting score, each unmet requirement deducts points and a below-threshold score can disqualify a bid. 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 C3PAO conducting a CMMC Level 2 assessment uses NIST SP 800-171A objectives. They expect a System Security Plan (SSP), Plan of Action & Milestones (POA&M) for any gaps, and objective evidence (configurations, ticket records, training records) for every requirement. Within **Maintenance**, the assessor will trace your implementation back to the catalogue reference (Requirement 3.7.4) 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. #### Secure Development **Pipeline.** Require code review, SAST (Semgrep / Snyk Code), SCA (Dependabot / Renovate), secret-scanning and IaC scanning in the merge pipeline. **Branch protection.** Protected branches enforce reviews, signed commits and passing CI before merge; document the protection rules as the control evidence. #### Physical Security **Inheritance.** For cloud-only operations, inherit physical controls from the provider's SOC 2 / ISO 27001 report and document the inheritance in the SoA. ### Operational checklist - **Information.** Document the trigger, the owner and the cadence. - **System.** Document the trigger, the owner and the cadence. - **Maintenance.** Document the trigger, the owner and the cadence. - **Media.** Document the trigger, the owner and the cadence. - **Physical.** Document the trigger, the owner and the cadence. - **Scope:** management, cui, security, tools, maintenance, code, development. ## Evidence to collect - **Code Repo Scan.** Source-control evidence — branch protection, required reviewers, CI status, SCA / SAST reports. Source control pipelines (GitHub, GitLab) enforce SDLC guardrails. Focus: Maintenance Tools. ## Common pitfalls - CI security checks set to warn-only; the merge button is faster than the security feedback. ## 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 800-53 Rev. 5 MA-3** — Maintenance Tools](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ma-3-maintenance-tools) - [**CIS Controls v8 16.12** — Implement Code-Level Security Checks](https://support.icompaas.com/compliance/cis-controls-v8/16-12-implement-code-level-security-checks) - [**ISO/IEC 27001:2022 A.8.28** — Secure coding](https://support.icompaas.com/compliance/iso-27001-2022/a-8-28-secure-coding) - [**SOC 2 (2017 TSC) CC1.3** — Organizational Structure and Reporting Lines](https://support.icompaas.com/compliance/soc-2-trust-services-criteria/cc1-3-organizational-structure-and-reporting-lines) - [**BSI C5:2020 DEV-08** — Version Control](https://support.icompaas.com/compliance/bsi-c5-2020/dev-08-version-control) ## Related controls in NIST SP 800-171 Rev. 3 - [**Requirement 3.13.13** — Mobile Code](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-13-13-mobile-code) - [**Requirement 3.14.2** — Malicious Code Protection](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-14-2-malicious-code-protection) ## References - [NIST Computer Security Resource Center — NIST SP 800-171 Rev. 3](https://csrc.nist.gov/pubs/sp/800/171/r3/final) - Catalogue identifier: `Requirement 3.7.4` Topics: application securitycode review testingsecure developmentdevsecopsphysical security ## Related compliance guidance - [NIST SP 800-171 and CMMC: a practical guide to protecting CUI in the cloud](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3): Start with the full NIST SP 800-171 implementation guide — scope, roadmap, evidence and how the assessment runs. - [NIST SP 800-53 Rev. 5: a practical implementation guide for cloud teams](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5): The catalogue 800-171 is tailored from, and the basis of the FedRAMP Moderate baseline your cloud providers must meet for CUI. - [ISO/IEC 27001:2022 compliance: a practical implementation guide](https://support.icompaas.com/compliance/iso-27001-2022): If commercial customers ask for a certificate as well, most 800-171 controls can be evidenced once and mapped to Annex A.