CMMC for MSPs and External Service Providers (ESPs)

When MSPs / ESPs Are In Scope

An ESP is typically in scope when it processes, stores, or transmits Federal Contract Information (FCI) or Controlled Unclassified Information (CUI), or provides security protection for systems that do. Common patterns:

• Hosting or administering CUI workloads (including GCC High / Azure Government tenancy operations)
• Endpoint management, identity, or privileged access on in-scope assets
• SIEM / SOC monitoring that receives in-scope logs
• Backup, DR, or ticketing systems that store CUI or security-relevant configuration

Use the scoping guide to draw CUI / Security Protection Data boundaries before you negotiate the matrix.

Two Common Delivery Models

Flow-Down and Contracting

Primes must flow applicable DFARS/CMMC obligations to subcontractors and service providers that handle FCI/CUI. See flow-down and the clause stack at DFARS 7012 / 7019 / 7020 / 7021. MSPs should expect:

• Cyber incident reporting interfaces aligned to DFARS 252.204-7012 (72-hour DoD reporting clock for covered incidents)
• Right-to-audit / assessment cooperation language
• Clear data handling, media return, and offboarding

Evidence MSPs Should Keep Ready

• Shared-responsibility matrix mapped to Level 1 (15 FAR) or Level 2 (110 / 800-171) requirements as applicable
• Change, access, and privileged-session records for customer estates
• Logging retention and SIEM use cases supporting AU / SI families
• Customer-facing incident runbooks with handoff timers

How CyberSilo Helps

• CSA control libraries so MSPs and OSCs share the same requirement IDs
• ThreatHawk for multi-tenant or dedicated logging evidence customers can sample
• Honest positioning: we automate evidence — we are not a substitute C3PAO

Frequently Asked Questions

Does using a compliant MSP make the contractor CMMC compliant?

No. The OSC remains responsible for its CMMC status, SPRS submissions, and affirmative statements. MSP controls must be in scope and evidenced.

Are MSPs always required to hold their own CMMC level?

It depends on contract flow-down, whether the MSP processes, stores, or transmits FCI/CUI, and how the customer scopes the ESP boundary. Many MSPs need their own programme; others are assessed inside the customer boundary — document the model explicitly.

What should an MSP put in a shared-responsibility matrix?

Map each relevant 800-171 (or FAR L1) requirement to Customer / MSP / Shared, with evidence owners, access paths for assessors, and incident-reporting interfaces for DFARS 252.204-21 / 252.204-7012 where applicable.

Related CMMC Resources

CMMC hub · Scoping · Flow-down · FedRAMP Moderate equivalency · SIEM for CMMC