Prepare for FedRAMP High with continuous evidence, not spreadsheets

FedRAMP High is the most stringent FedRAMP security baseline for cloud services used by US federal agencies. The Rev. 5 version contains 410 NIST SP 800-53 Rev. 5 controls and enhancements across 18 families. It is intended for systems where a loss of confidentiality, integrity or availability could have a severe or catastrophic effect on agency operations, assets or individuals.

Cloud service providers need FedRAMP High when a federal agency wants to use their service for high-impact systems. Typical examples include law enforcement, emergency services, financial and health systems. Most commercial SaaS used by agencies sits at Low or Moderate instead, so the agency's impact categorisation of the data decides which baseline applies.

FedRAMP High requires 410 controls and enhancements, compared with 323 in the Rev. 5 Moderate baseline. The extra requirements sit mainly in contingency planning, audit logging, incident response, access control and system integrity, with stronger expectations for redundancy, monitoring and response. Both baselines are built on NIST SP 800-53 Rev. 5 with FedRAMP-specific parameters and guidance.

FedRAMP 20x is FedRAMP's newer, automation-based certification model built around Key Security Indicators. Classes A, B and C are available now, but Class D, which covers High, is still being developed, with a pilot estimated for FY27 Q1 to Q2. Until Class D is finalised, High services follow the Rev. 5 process, which closes to new applications on 11 June 2027.

Under Rev. 5, a cloud service provider needs a federal agency sponsor, implements the High baseline and documents it in a System Security Plan. A FedRAMP recognised independent assessor then tests the controls, the agency issues its authorisation and FedRAMP reviews the package. After that, the provider must meet continuous monitoring requirements, including regular vulnerability scanning and reporting.

ISO 27001 and SOC 2 do not replace FedRAMP High, but much of the work overlaps. Access control, logging, change management, incident response and supplier risk all appear in each. FedRAMP High is far more prescriptive, with defined parameters such as scan frequencies and specific technical controls, so organisations with ISO 27001 or SOC 2 usually still have significant gaps to close.

There is no fixed timeline for FedRAMP High. The time depends on how mature your security programme is, how many of the 410 controls are already in place, assessor availability and your sponsoring agency's review. High is the most demanding baseline, so readiness and remediation work is usually substantial. FedRAMP aims to give initial assessment decisions within 30 days of application.

FedRAMP Rev. 5 High is mapped in OneClickComply's control library and available on request. It is not yet a live self-service framework in the platform. On request, we can track the baseline alongside frameworks you already use, collect evidence automatically and monitor controls continuously. OneClickComply does not issue FedRAMP certifications: those come from your sponsoring agency and FedRAMP.