FedRAMP High Baseline

What the FedRAMP High Baseline Is and Why It Exists

The Federal Risk and Authorization Management Program (FedRAMP) standardizes how the US government assesses and authorizes cloud services. The High baseline is its most stringent tier, designed for cloud systems that process high-impact federal information, where loss of confidentiality, integrity, or availability could have a severe or catastrophic effect. Introduced in 2016, it extended FedRAMP beyond low and moderate systems to cover sensitive workloads such as law enforcement, emergency services, and health data.

It exists so that agencies can adopt cloud services without each one performing a separate, costly security review. A single authorization can be reused across the government under a "do once, use many times" model.

Who It Applies To

The High baseline applies to cloud service providers seeking to host high-impact federal data and to the agencies that use them. It is required when a system's FIPS 199 categorization is High. Providers targeting only less sensitive workloads may pursue the Low or Moderate baselines instead, but those handling the most sensitive unclassified federal data must meet High.

Key Requirements

• Control implementation: the High baseline maps to a large set of NIST SP 800-53 controls, more than the Moderate baseline.
• Independent assessment: a Third-Party Assessment Organization (3PAO) evaluates the system and produces a Security Assessment Report.
• Authorization: the provider obtains an authorization, either agency-issued or through the Joint Authorization Board path historically used for high-profile services.
• Continuous monitoring: ongoing scanning, reporting, and Plan of Action and Milestones tracking are mandatory.
• Incident response and reporting must align with federal requirements.

Penalties for Non-Compliance

FedRAMP is a precondition for selling cloud services to federal agencies, so the chief consequence of non-compliance is ineligibility: agencies cannot lawfully use a non-authorized cloud service for covered data. Losing an authorization, for example after a failed continuous-monitoring review, can suspend the provider's federal business and damage its standing. Misrepresentations in the authorization package can also create False Claims Act exposure.

How to Comply

• Confirm the impact level of the data your service will host; High applies to high-impact systems.
• Implement the High control baseline and document a System Security Plan.
• Engage an accredited 3PAO for the security assessment.
• Pursue an Authority to Operate through an agency sponsor.
• Stand up continuous monitoring with monthly vulnerability scanning and reporting.
• Maintain the authorization through timely remediation and annual assessments.

Reaching the High baseline is demanding and typically requires mature security engineering well before assessment begins.

Continuous Monitoring and Reuse

A defining feature of FedRAMP is reuse: once a cloud service is authorized, other agencies can leverage the existing package rather than starting over, dramatically lowering the cost of secure adoption across government. Sustaining a High authorization, however, is demanding. Providers must submit monthly continuous-monitoring deliverables, including vulnerability scan results and an updated Plan of Action and Milestones, and remediate findings within strict timelines based on severity. Significant changes to the system require formal review. For provider engineering teams, this makes automation essential: scan pipelines, configuration baselines as code, and evidence generation must run continuously, because the authorization is a living state that can be revoked if monitoring obligations lapse.