# NIST SP 800-53 Rev. 5 SA-8(27) — Human Factored Security - Source: https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sa-8-27-human-factored-security - 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) › SA — System and Services Acquisition - Last updated: 2026-06-05 - Publisher: iCompaas, Inc. (https://www.icompaas.com) **NIST SP 800-53 Rev. 5**·Control `SA-8(27)`·high·Component: **System and Services Acquisition** ## What this control requires > Implement human factored security by designing intuitive, non-intrusive security interfaces that offer clear feedback. Ensure users and administrators can confidently configure and operate security policies without degrading usability or efficiency. This control supports the Usability-Centric Security Interface capability within the System and Services Acquisition family. > > — NIST SP 800-53 Rev. 5, Control SA-8(27) ### In plain English Implement human factored security by designing intuitive, non-intrusive security interfaces that offer clear feedback. 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 Services Acquisition**, the assessor will trace your implementation back to the catalogue reference (Control SA-8(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. - **Human.** 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. - **System.** Document the trigger, the owner and the cadence. - **Scope:** management, system, feedback, configuration, services, capability, implement, security. ## 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: Human Factored Security. ## 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 3.4.6** — Least Functionality](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-4-6-least-functionality) - [**BSI C5:2020 INQ-02** — INQ-02 Informing Cloud Customers about Investigation Requests](https://support.icompaas.com/compliance/bsi-c5-2020/inq-02-inq-02-informing-cloud-customers-about-investigation-requests) - [**ISO/IEC 27001:2022 A.8.22** — Segregation of networks](https://support.icompaas.com/compliance/iso-27001-2022/a-8-22-segregation-of-networks) - [**CIS Controls v8 18.4** — Validate Security Measures](https://support.icompaas.com/compliance/cis-controls-v8/18-4-validate-security-measures) ## Related controls in NIST SP 800-53 Rev. 5 - [**Control SA-19(2)** — Configuration Control For Component Service And Repair](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sa-19-2-configuration-control-for-component-service-and-repair) - [**Control SA-4(5)** — System, Component, And Service Configurations](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sa-4-5-system-component-and-service-configurations) - [**Control SA-10** — Developer Configuration Management](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sa-10-developer-configuration-management) - [**Control CM-2** — Baseline Configuration](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/cm-2-baseline-configuration) - [**Control SA-8(21)** — Self-Analysis](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sa-8-21-self-analysis) - [**Control CM-2(7)** — Configure Systems And Components For High-Risk Areas](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/cm-2-7-configure-systems-and-components-for-high-risk-areas) ## 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 SA-8(27)` Topics: governance riskcloud postureconfiguration managementnetwork security ## 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.