NIST SP 800-53 Rev. 5 AC-19 — Access Control For Mobile Devices : iCompaas Support

NIST SP 800-53 Rev. 5·Control AC-19·high·Component: Access Control

What this control requires

Establishes configuration and connection requirements for organization-controlled mobile devices, including when outside controlled areas; authorizes connections to organizational systems. This control supports the Mobile Device Management (MDM) System capability within the Access Control family.
— NIST SP 800-53 Rev. 5, Control AC-19

In plain English

Establishes configuration and connection requirements for organization-controlled mobile devices, including when outside controlled areas; authorizes connections to organizational systems. In practice, this means you can prove you access management-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 Access Control, the assessor will trace your implementation back to the catalogue reference (Control AC-19) 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.

Configuration Management

Policy-as-code. Codify the control as Service Control Policies (AWS), Azure Policy initiatives, or Organisation Policy (GCP) so the platform enforces what the document promises.

IaC. Gate Terraform / Pulumi / CloudFormation changes with Checkov / tfsec / OPA so misconfigurations never reach production.

Drift. Run a CSPM (Wiz / Prisma / Defender for Cloud / Security Command Center) over every account and route findings to a single risk register.

Operational checklist

Access. Document the trigger, the owner and the cadence.
Security. Document the trigger, the owner and the cadence.
Configuration. Document the trigger, the owner and the cadence.
Device. Document the trigger, the owner and the cadence.
Protection. Document the trigger, the owner and the cadence.
Scope: management, access control, organization, system, mobile devices, protection, configuration, capability.

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: Access Control For Mobile Devices.

Common pitfalls

Pilot MDM rollouts that quietly exclude executives or engineers; carving out the highest-risk users is the most common audit failure.
Manual cloud-console changes that never make it back to Terraform — drift accumulates until the next outage forces a reconciliation.

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 3.1.18 — Access Control for Mobile Devices

Related controls in NIST SP 800-53 Rev. 5

References

NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
Catalogue identifier: Control AC-19

Topics: endpoint securityendpoint protectionconfiguration management

NIST SP 800-53 Rev. 5 AC-19 — Access Control For Mobile Devices