The High Baseline is the most rigorous tier of FedRAMP authorization. It covers systems that process highly sensitive government data, requiring the strictest safeguards. At this level, every security measure must meet or exceed the NIST SP 800-53 controls, with over 400 individual requirements. These controls span access management, encryption standards, continuous monitoring, incident response, and configuration management.
The review process is unforgiving. Documentation must be exact. Evidence must be verifiable. System Security Plans must map every requirement to actual implementations. Assessors will validate everything—from account lifecycle policies to patch cadence to intrusion detection coverage. Gaps are not tolerated.
Achieving the High Baseline means implementing mandatory FIPS-validated cryptography for data in transit and at rest. It means enforcing strong authentication, strict role separation, logging every administrative action, and reviewing these logs continuously. Vulnerability scans must run frequently and remediation must be fast. The Plan of Action and Milestones (POA&M) needs measurable timelines and real accountability.