achieving-cmmc-level-2-compliance

Imported from mukul975/anthropic-cybersecurity-skills (skills/achieving-cmmc-level-2-compliance/SKILL.md). Install upstream with npx skills add mukul975/anthropic-cybersecurity-skills --skill achieving-cmmc-level-2-compliance. Copyright stays with the author (Apache-2.0).

Achieving CMMC Level 2 Compliance

When to Use

• When an organization in the Defense Industrial Base (DIB) stores, processes, or transmits Controlled Unclassified Information (CUI) under a DoD contract.
• When a contract includes DFARS 252.204-7012 (safeguarding/incident reporting), -7019/-7020 (NIST 800-171 self-assessment + SPRS), or the new -7021 (CMMC requirement).
• When preparing for a C3PAO third-party assessment or a DoD-led assessment.
• When you must compute, post, or improve an SPRS score based on the NIST SP 800-171 DoD Assessment Methodology.
• When authoring or remediating a System Security Plan (SSP) and POA&M for the 110 requirements.
• When scoping which assets fall inside the CUI/FCI boundary (CUI assets, security-protection assets, contractor risk-managed assets, out-of-scope).

Prerequisites

• Knowledge of which contracts carry CUI and the CUI categories involved (check the contract and the DoD CUI Registry).
• An asset inventory and network diagram so you can define the CMMC assessment scope before assessing controls.
• The NIST SP 800-171 Rev 2 requirements and the DoD Assessment Methodology scoring weights.
• A documented SSP (its absence is itself a failed requirement — 3.12.4).
• Identification of any External Service Providers (ESPs) / cloud services touching CUI, and whether they meet FedRAMP Moderate (or equivalency).

Workflow

1. Determine applicability and CUI categories

Confirm the contract requires CMMC Level 2 (CUI present, not just FCI). FCI-only contracts are Level 1 (the 15 FAR 52.204-21 requirements). Identify CUI categories from the contract and the DoD CUI Registry.

2. Scope the environment

Classify every asset into one of the CMMC scoping categories:

• CUI Assets — process/store/transmit CUI (in scope, assessed against all applicable controls).
• Security Protection Assets — provide security to the CUI environment (in scope).
• Contractor Risk Managed Assets — could but are not intended to handle CUI; managed by policy.
• Specialized Assets (IoT/OT, GFE, test equipment) — documented, limited assessment.
• Out-of-Scope — physically/logically isolated from CUI.

Minimize scope deliberately — a smaller, well-segmented CUI enclave is far cheaper to certify than a flat network.

3. Implement the 110 requirements (NIST SP 800-171 Rev 2)

Work the 14 families (3.1–3.14). For each requirement, implement, then write the how in the SSP. High-leverage early wins: MFA (3.5.3), FIPS-validated cryptography (3.13.11), audit logging (3.3.x), access control + least privilege (3.1.x), and incident response (3.6.x).

4. Score with the DoD Assessment Methodology (SPRS)

Start at 110 and subtract the weighted value (1, 3, or 5 points) of each unmet requirement; partial credit applies to a small number of controls (e.g., MFA, FIPS crypto). The result is the SPRS score (maximum 110; the methodology floor is −203). Post the score, the SSP date, and the assessment scope to SPRS (or eMASS for higher assessments).

5. Build a compliant POA&M

Document every unmet requirement with owner, remediation, and milestone. Constraints under the CMMC rule: a Conditional status requires a score of at least 80% (≥ 88 of 110), only POA&M-eligible requirements may be deferred (the highest-weighted security requirements must be fully met — verify eligibility against 32 CFR Part 170), and all POA&M items must be closed within 180 days to convert Conditional → Final.

6. Assess (self or C3PAO)

• Level 1 and a subset of Level 2 = annual self-assessment with an affirmation in SPRS.
• Level 2 (most CUI contracts) = triennial C3PAO certification assessment.
• Level 3 = DoD (DIBCAC) assessment on top of Level 2, adding SP 800-172 enhanced requirements. Assessors evaluate each objective as MET / NOT MET / N/A with evidence (examine/interview/test). A senior official files the annual affirmation of continued compliance.

7. Maintain certification

Certification is valid three years with annual affirmations. Maintain the SSP, re-score on change, keep evidence current, and feed significant changes back into the assessment.

Key Concepts

Tools & Systems

• NIST SP 800-171 Rev 2 — the 110 requirements (and 800-171A for assessment objectives).
• DoD NIST SP 800-171 Assessment Methodology — the scoring weights.
• 32 CFR Part 170 (CMMC Program rule) and 48 CFR / DFARS 252.204-7021 (acquisition rule).
• SPRS — score posting; SAM.gov for registration.
• SP 800-172 / 800-172A — enhanced requirements for Level 3.
• GRC / compliance tooling — to manage the SSP, POA&M, and evidence (e.g., Xacta, RegScale, FutureFeed-style trackers).

Common Scenarios

• Prime flows CUI to a sub. The sub needs its own Level 2 scope, SSP, SPRS score, and (most likely) C3PAO certification.
• Score is below 88. Prioritize the highest-weighted unmet requirements (5-point, then 3-point) to clear the conditional threshold and shrink the POA&M.
• Cloud holds CUI. Confirm the service is FedRAMP Moderate authorized or meets equivalency; document the responsibility split.
• Flat network. Re-scope into a segmented CUI enclave to cut the assessment surface before spending on controls.
• Annual affirmation due. A senior official affirms continued compliance in SPRS; let it lapse and you risk contract eligibility.

Output Format

Produce a CMMC Level 2 Readiness Report using assets/template.md, containing:

1. Applicability & CUI categories — why Level 2 applies.
2. Scope — assets by scoping category and the CUI boundary diagram reference.
3. Control status by family — met / not met / N/A across the 14 families.
4. SPRS score — computed score, deductions, and the gap to 110 and to the 88 threshold.
5. POA&M — unmet requirements, eligibility check, owners, 180-day milestones.
6. Assessment path — self vs C3PAO, target date, affirmation owner.
7. Remediation roadmap — sequenced by point value and effort.

Use scripts/process.py to compute the SPRS score from a control-status JSON, flag POA&M-eligibility concerns, and report the gap to the conditional-certification threshold.