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NIST 800-53 RMF Assessment Services

Achieving and maintaining compliance for federal systems.

The NIST Risk Management Framework (RMF) provides a mandatory, structured process for managing security and privacy risk for federal information systems. Implementing RMF is essential for government agencies and contractors handling federal data to achieve an Authority to Operate (ATO).

Proof

Experienced assessors with deep history supporting DoD, civilian agency, and FedRAMP authorization packages.

7
RMF steps covered end-to-end (Prepare → Monitor)
Rev. 5
Latest 800-53 control catalog and overlays
FIPS 199
Impact categorization grounded in mission analysis
ATO-ready
Authorization packages built for AO signature
Overview

What this engagement looks like

NIST 800-53 RMF Assessment Services — visual

Maverc offers comprehensive RMF support services, guiding organizations through each step of the RMF lifecycle — Categorize, Select, Implement, Assess, Authorize, and Monitor. Our experts help you categorize systems, select and implement controls, conduct assessments, authorize systems, and establish continuous monitoring programs, ensuring compliance with FISMA and NIST standards (such as SP 800-53 and applicable DISA STIGs).

Outcomes you'll see

  • Authorization packages your AO will actually sign — first review
  • Defensible Security Assessment Reports backed by tested evidence
  • SSPs that match implementation, not aspiration
  • Realistic, risk-prioritized POA&Ms that close on schedule
  • Continuous monitoring that catches drift before the next audit
  • Reduced reassessment burden through reusable control evidence
Capabilities

What's included

Each engagement is scoped to your environment — these are the building blocks we draw from.

RMF Step 1 — Prepare: organizational and system-level risk framing
RMF Step 2 — Categorize: FIPS 199 impact analysis and system boundary definition
RMF Step 3 — Select: 800-53 Rev. 5 baseline tailoring and overlay selection
RMF Step 4 — Implement: control engineering and inheritance mapping
RMF Step 5 — Assess: independent Security Control Assessment (SCA) and SAR authoring
RMF Step 6 — Authorize: ATO package preparation and AO briefing support
RMF Step 7 — Monitor: continuous monitoring (ConMon) strategy and execution
System Security Plan (SSP) authoring and maintenance
POA&M development, prioritization, and remediation tracking
Privacy control assessments (NIST SP 800-53A)
FedRAMP Moderate / High readiness and 3PAO coordination
FISMA reporting and CIO/IG metric support
DoD RMF (eMASS) package authoring and assessment
Inheritance mapping for cloud service offerings (CSO) and common control providers
Why Maverc

What makes this different

Assessor-grade rigor

Our team has served as both 3PAO assessors and ISSO-side defenders. We know exactly what evidence holds up under independent review — and we build packages to that standard from day one.

Engineered controls, not paper controls

We don't write SSP narratives that don't match the system. Our engineers implement the control, capture the evidence, and only then describe it — so what's on paper is what's actually running.

eMASS, Xacta, and CSAM fluent

We work natively in the GRC tooling your agency or sponsor already uses. No re-keying, no parallel spreadsheets, no surprises at the AO briefing.

Reusable across frameworks

Our 800-53 evidence is cross-mapped to CMMC, FedRAMP, SOC 2, and ISO 27001 — collect once, reuse everywhere your authorization scope grows.

Deep Dive

Where we go further

FIPS 199 categorization done right

The single most consequential decision in your RMF journey is impact categorization — get it wrong and you over-engineer (burning budget) or under-engineer (failing assessment). We facilitate categorization workshops grounded in real mission impact analysis, not checkbox guesses.

SSPs that survive independent assessment

Most SSPs fail because the narrative describes a control that isn't actually implemented. We pair every control response with tested evidence, inheritance citations, and parameter values — so when the SCA arrives, the package speaks for itself.

ConMon that's actually continuous

Continuous monitoring is where most authorization packages decay. We build ConMon programs around automated evidence collection, monthly POA&M cadence, and annual assessment refreshes — keeping your ATO defensible through its full term.

Methodology

Our end-to-end process

A proven, repeatable methodology aligned to PTES, OWASP, NIST 800-115, and MITRE ATT&CK.

  1. 01

    Prepare

    • Organizational risk frame and roles assignment
    • System and authorization boundary definition
    • Common control identification and inheritance planning
    • Stakeholder kickoff with AO, ISSO, ISSM, and SO
  2. 02

    Categorize

    • FIPS 199 impact analysis (Confidentiality, Integrity, Availability)
    • Information type identification (NIST SP 800-60)
    • System description and architecture documentation
    • Categorization decision memo for AO concurrence
  3. 03

    Select

    • NIST 800-53 Rev. 5 baseline selection (Low / Moderate / High)
    • Overlay application (Privacy, CUI, HVA, Classified, Cloud)
    • Control tailoring with documented rationale
    • Monitoring strategy and assessment frequency
  4. 04

    Implement

    • Technical, operational, and management control engineering
    • SSP control response authoring with parameter values
    • Inheritance mapping to common control providers
    • Evidence collection plan and artifact repository setup
  5. 05

    Assess

    • Independent Security Control Assessment (SCA) per 800-53A
    • Test, examine, and interview procedures by control family
    • Security Assessment Report (SAR) with findings and risk ratings
    • POA&M development with realistic remediation milestones
  6. 06

    Authorize

    • Authorization package assembly (SSP, SAR, POA&M, ConMon strategy)
    • Risk executive function briefing materials
    • AO decision support and authorization recommendation
    • ATO letter, IATT, or denial coordination
  7. 07

    Monitor

    • Automated control evidence collection and validation
    • Monthly POA&M reviews and milestone tracking
    • Annual control reassessment per monitoring strategy
    • Significant change analysis and reauthorization triggers
Deliverables

What you walk away with

Clear, executive-grade artifacts your team, your auditors, and your customers can actually use.

  • FIPS 199 categorization decision memo
  • Tailored NIST 800-53 Rev. 5 control baseline with overlay rationale
  • System Security Plan (SSP) with evidence-mapped control responses
  • Security Assessment Plan (SAP) and test procedures
  • Security Assessment Report (SAR) with risk-rated findings
  • Plan of Action and Milestones (POA&M) with prioritized remediation
  • Continuous Monitoring (ConMon) strategy and operating runbooks
  • Complete authorization package ready for AO signature
  • eMASS / Xacta / CSAM artifact uploads and quality checks
Engagement Models

How we work together

From a focused point-in-time test to continuous offensive coverage — pick the model that fits your maturity.

RMF Sprint

Targeted support to unblock a stalled authorization

  • Gap assessment against current RMF step
  • SSP, SAR, or POA&M remediation as scoped
  • AO/ISSM coordination and briefing support
  • Up to 60-day focused engagement
Best for

Programs with an existing package that needs to cross the finish line.

Full ATO Support

End-to-end RMF execution from Prepare through Authorize

  • All seven RMF steps led by Maverc with your team
  • Complete authorization package authoring
  • Independent SCA conducted by senior assessors
  • AO briefing and authorization decision support
Best for

New systems pursuing a first-time ATO or major reauthorization.

ConMon as a Service

Keep your ATO defensible across its full term

  • Monthly POA&M reviews and milestone tracking
  • Automated evidence collection and validation
  • Annual control reassessments per ConMon strategy
  • Significant change analysis and reauthorization triggers
Best for

Authorized systems that need sustained compliance without standing up an internal team.

Tools & platforms

Experience with standardized tools

DISA STIGsSCAP Compliance CheckerSTIG ViewereMASSXacta 360CSAMRegScaleTenable.sc / NessusSplunkMicrosoft SentinelAWS Audit ManagerAzure Compliance Manager
Industries served

Where we operate

  • Federal civilian agencies
  • Department of Defense
  • Defense Industrial Base (DIB)
  • FedRAMP cloud service providers
  • State & local government
  • FFRDCs & national labs
Our Approach

How we deliver

01

Categorize & Select

Define the system boundary, complete FIPS 199 categorization, and tailor the appropriate 800-53 Rev. 5 baseline with required overlays (Privacy, CUI, High-Value Asset, etc.).

02

Implement & Document

Engineer the technical, operational, and management controls. Author the SSP with control responses that match real implementation and inherited control evidence.

03

Assess, Authorize & Monitor

Conduct the independent SCA, deliver the SAR and POA&M, support the AO authorization decision, then operate continuous monitoring through the system lifecycle.

FAQ

Common questions

What are the steps in the NIST RMF process?

The RMF (NIST SP 800-37 Rev. 2) consists of seven steps: Prepare, Categorize, Select, Implement, Assess, Authorize, and Monitor. Maverc supports every step end-to-end or as targeted assistance.

Who needs to follow the RMF?

All U.S. federal agencies must follow the RMF for their information systems under FISMA. Contractors operating systems on behalf of agencies, FedRAMP cloud service providers, and DoD contractors handling federal data are also required to comply.

What is an Authority to Operate (ATO)?

An ATO is the official management decision issued by an Authorizing Official (AO) to authorize operation of an information system and explicitly accept the residual risk based on the implemented controls and assessment results.

How does RMF relate to FISMA?

FISMA requires federal agencies to implement information security programs. The NIST RMF — built on NIST SP 800-37, 800-53, 800-53A, and 800-60 — is the mandatory framework agencies use to meet those FISMA requirements.

Can you serve as an independent Security Control Assessor (SCA)?

Yes. Our senior assessors regularly perform independent SCAs and produce Security Assessment Reports (SARs) that hold up to AO and IG scrutiny. Independence requirements are honored — we don't assess controls we engineered.

Do you work in eMASS, Xacta, or CSAM?

Yes. We author and maintain authorization packages directly in the GRC tooling your agency or sponsor uses, including eMASS for DoD, Xacta 360, RegScale, and CSAM for civilian agencies.

How long does a typical ATO take?

For a Moderate-impact system with a reasonable starting baseline, expect 4–9 months from Prepare to ATO. High-impact systems, FedRAMP authorizations, and packages with significant remediation can run 9–18 months.

Talk to a specialist

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