# NIST SP 800-53 Rev. 5 SC-27 — Platform-Independent Applications

- Source: https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sc-27-platform-independent-applications
- Section: [Compliance](https://support.icompaas.com/compliance) › [NIST SP 800-53 Rev. 5 Controls](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5) › SC — System and Communications Protection
- Last updated: 2026-06-05
- Publisher: iCompaas, Inc. (https://www.icompaas.com)

**NIST SP 800-53 Rev. 5**·Control `SC-27`·high·Component: **System and Communications Protection**

## What this control requires

> Include within organizational systems platform-independent applications, which are capable of executing on multiple platforms. These applications promote portability and the ability to reconstitute functionality across different hardware, firmware, and software components. Platform-independent applications increase the availability of mission-essential functions by ensuring that they can operate on various platforms, especially in situations where systems with specific operating systems are under attack. This control supports the Platform-Independent Application Management System capability within the System and Communications Protection family.
> 
> — NIST SP 800-53 Rev. 5, Control SC-27

### In plain English

Include within organizational systems platform-independent applications, which are capable of executing on multiple platforms. In practice, this means you can prove you security 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 **System and Communications Protection**, the assessor will trace your implementation back to the catalogue reference (Control SC-27) 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

-   **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.
-   **Protection.** Document the trigger, the owner and the cadence.
-   **Hardware.** Document the trigger, the owner and the cadence.
-   **Scope:** management, mission, system, application, functions, protection, configuration, hardware.

## 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: Platform-Independent Applications.

## 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.

## 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 3.14.6** — System Monitoring](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-14-6-system-monitoring)
-   [**BSI C5:2020 COS-05** — Networks for administration](https://support.icompaas.com/compliance/bsi-c5-2020/cos-05-networks-for-administration)

## Related controls in NIST SP 800-53 Rev. 5

-   [**Control SC-29(1)** — Virtualization Techniques](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sc-29-1-virtualization-techniques)
-   [**Control SC-7(16)** — Prevent Discovery Of System Components](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sc-7-16-prevent-discovery-of-system-components)
-   [**Control SC-7(29)** — Separate Subnets To Isolate Functions](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sc-7-29-separate-subnets-to-isolate-functions)
-   [**Control SC-10** — Network Disconnect](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sc-10-network-disconnect)
-   [**Control SC-4(1)** — Security Levels](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sc-4-1-security-levels)
-   [**Control SC-7(5)** — Deny By Default -- Allow By Exception](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sc-7-5-deny-by-default-allow-by-exception)

## References

-   [NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5](https://csrc.nist.gov/Projects/risk-management/sp800-53-controls)
-   Catalogue identifier: `Control SC-27`

Topics: network securityapplication securitycloud infrastructurecloud postureconfiguration management

## Related compliance guidance

- [NIST SP 800-53 Rev. 5: a practical implementation guide for cloud teams](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5): Start with the full NIST SP 800-53 implementation guide — scope, roadmap, evidence and how the assessment runs.
- [NIST SP 800-171 and CMMC: a practical guide to protecting CUI in the cloud](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3): If your obligation is protecting CUI in your own systems for a federal or defence contract, this derived subset — not the full catalogue — is the requirement.
- [SOC 2 compliance: a practical implementation guide for cloud-native SaaS teams](https://support.icompaas.com/compliance/soc-2-trust-services-criteria): Most commercial SaaS already hold a SOC 2 Type 2, and FedRAMP 20x Class A is designed for providers that have one.