NIST SP 800-53 Rev. 5 AC-18(3) — Disable Wireless Networking

What this control requires

Disables wireless networking capabilities in system components when not needed, reducing vulnerabilities from adversaries exploiting embedded wireless technologies before deployment. This control supports the Wireless Network Interface Card capability within the Access Control family.

In plain English

Disables wireless networking capabilities in system components when not needed, reducing vulnerabilities from adversaries exploiting embedded wireless technologies before deployment. In practice, this means you can prove you disable 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.

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-18(3)) and look for objective evidence on the latest two assessment cycles.

How to implement

Cloud Posture

CSPM. Run Wiz / Prisma / Defender for Cloud / Security Command Center over every account; auto-ticket findings above your accepted-risk threshold.

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.

Network Security

AWS. VPC Flow Logs to S3, default-deny security groups, AWS Network Firewall for north-south, and Transit Gateway for hub-and-spoke segmentation.

Azure. NSGs with deny-by-default, Azure Firewall Premium with TLS inspection, Private Endpoints for PaaS, and Microsoft Defender for Cloud's secure score for drift.

GCP. VPC Service Controls perimeters around sensitive APIs, Cloud NGFW Enterprise for L7 inspection, Private Service Connect for managed services.

Operational checklist

• Disable. Document the trigger, the owner and the cadence.
• 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.
• Network. Document the trigger, the owner and the cadence.
• Scope: management, access control, system, wireless network, configuration, components, capability, system components.

Evidence to collect

• Infra Scan. Continuous infrastructure-posture telemetry — AWS Config, Azure Policy compliance, GCP Organisation Policy, Wiz / Prisma findings.

Infrastructure posture tooling (AWS Config, Azure Policy, Nessus) verifies platform hardening. Focus: Disable Wireless Networking.

Common pitfalls

• Treating CSPM findings as a backlog instead of a hot queue: findings older than the policy SLA accumulate until the auditor asks why.
• Manual cloud-console changes that never make it back to Terraform — drift accumulates until the next outage forces a reconciliation.
• Default-allow egress rules; East-West traffic with no segmentation; jump hosts on the public internet with password auth.
• Scans that hit only the perimeter; missing authenticated scans of OS, runtime libs and base images so most CVEs are invisible.

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 3.4.6 — Least Functionality
• BSI C5:2020 COM-04 — Information on information security performance and management assessment of the ISMS
• ISO/IEC 27001:2022 A.8.21 — Security of network services
• CIS Controls v8 13.4 — Perform Traffic Filtering Between Network Segments

Related controls in NIST SP 800-53 Rev. 5

• Control AC-18(4) — Restrict Configurations By Users
• Control AC-17(3) — Managed Access Control Points
• Control AC-20(4) — Network Accessible Storage Devices -- Prohibited Use
• Control SC-7(16) — Prevent Discovery Of System Components
• Control SC-7(29) — Separate Subnets To Isolate Functions
• Control AC-4(7) — One-Way Flow Mechanisms

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control AC-18(3)

Topics: network securitycloud postureconfiguration managementvulnerability management