NIST SP 800-53 Rev. 5 SC-5(1) — Restrict Ability To Attack Other Systems

What this control requires

Restrict individuals from launching organization-defined denial-of-service attacks against other systems. Disable mechanisms commonly used for such attacks, limit excessive resource usage, and prohibit egress to potential targets via boundary devices. This control supports the Internal DoS Attack Restriction Protocol capability within the System and Communications Protection family.

In plain English

Restrict individuals from launching organization-defined denial-of-service attacks against other systems. In practice, this means you can prove you disable organization-level controls on a defined cadence.

Why it matters

SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed.

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 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan.

Within System and Communications Protection, the assessor will trace your implementation back to the catalogue reference (Control SC-5(1)) and look for objective evidence on the latest two assessment cycles.

How to implement

Endpoint Protection

MDM. Make MDM enrollment a hard gate for device access (Intune compliance + Conditional Access, or Jamf + Okta device trust). Unmanaged devices simply don't get a session token.

EDR. Deploy CrowdStrike / SentinelOne / Defender for Endpoint to every server and laptop; alert on any host that stops sending telemetry for >24h.

Operational checklist

• Disable. Document the trigger, the owner and the cadence.
• Usage. Document the trigger, the owner and the cadence.
• Restrict. Document the trigger, the owner and the cadence.
• Security. Document the trigger, the owner and the cadence.
• Internal. Document the trigger, the owner and the cadence.
• Scope: organization, system, service, protection, capability, systems, security, mechanisms.

Evidence to collect

• User Device Scan. MDM compliance state per user device (Intune / Jamf / Workspace ONE).

Endpoint compliance telemetry (Intune, Jamf) proves managed coverage. Focus: Restrict Ability To Attack Other Systems.

Common pitfalls

• Pilot MDM rollouts that quietly exclude executives or engineers; carving out the highest-risk users is the most common audit failure.

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 800-171 Rev. 3 3.13.1 — Boundary Protection

Related controls in NIST SP 800-53 Rev. 5

• Control SC-7(7) — Split Tunneling For Remote Devices
• Control SC-15 — Collaborative Computing Devices And Applications
• Control SC-15(3) — Disabling And Removal In Secure Work Areas
• Control SC-7(12) — Host-Based Protection
• Control AC-19 — Access Control For Mobile Devices
• Control SC-15(1) — Physical Or Logical Disconnect

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control SC-5(1)

Topics: endpoint securityendpoint protection