For Federal Contractors, FedRAMP Aspirants, and Regulated Financial Services Teams
Map your control environment to the full 800-53 Rev 5 catalog — 298 controls across 20 families — with continuous assessment, evidence linkage, and audit-ready documentation.
NIST Special Publication 800-53 Revision 5 is the federal catalog of security and privacy controls for information systems and organizations. The current revision contains 298 controls organized into 20 families covering access control, audit and accountability, system and communications protection, incident response, supply chain risk management, and more. It underpins FedRAMP authorization, FISMA compliance, and a growing number of state and contractual requirements.
Rev 5 introduced a unified control catalog covering both security and privacy, added the Supply Chain Risk Management (SR) family, and restructured controls around outcomes rather than impact baselines. Organizations select a baseline (Low, Moderate, High) appropriate to their system's impact level, then tailor controls based on a documented risk assessment.
“800-53 is the most comprehensive controls catalog in the federal compliance landscape. Its strength is depth — its operational challenge is keeping evidence current for hundreds of distinct controls.”
The volume is the issue. A Moderate baseline alone exceeds 200 controls, each with its own evidence requirements and assessment cadence. Teams that rely on spreadsheets for SSP maintenance discover during continuous monitoring that control documentation has drifted from operational reality, evidence is stored in silos, and the assessment cycle compresses against deadline pressure.
FedRAMP and FISMA programs add a continuous monitoring obligation: monthly POA&M updates, ongoing assessment of a subset of controls, and annual reassessment of the full baseline. Without a system that tracks evidence linkage and control status continuously, the gap between SSP documentation and operational truth widens with every release cycle.
Thirdsentry seeds the full 298-control 800-53 Rev 5 catalog into your environment. The platform maps your existing controls to 800-53 control families, identifies coverage gaps, and tracks evidence linkage at the individual control level — not just at the family level.
Internal assessments run against your selected baseline (Low, Moderate, High) with AI-powered scoring that evaluates control effectiveness, generates findings for weak or missing controls, and creates risk register entries with remediation tasks. Continuous monitoring becomes a structured cadence rather than a year-end scramble.
Evidence collected in the vault links to specific 800-53 control identifiers, building a persistent System Security Plan backbone. When your 3PAO or assessor asks for evidence of AC-2 account management or SI-4 system monitoring operating over the assessment period, the trail already exists.
All 298 controls across 20 families, pre-mapped and ready to activate at the appropriate baseline for your system.
Select Low, Moderate, or High baseline and document control tailoring decisions with linked rationale.
SR control family integrated with TPRM module for vendor risk evidence flowing into 800-53 documentation.
Structured cadence for ongoing assessment subsets, POA&M tracking, and annual reassessment cycles.
800-53 controls mapped to NIST CSF subcategories, SOC 2 TSC, and ISO 27001 Annex A — one control, multiple frameworks.
Evidence vault entries link to specific control identifiers, building a living System Security Plan.
Thirdsentry provides the operational layer for 800-53 Rev 5 control mapping, evidence collection, and continuous assessment that FedRAMP requires. The platform is not a 3PAO and does not replace the FedRAMP authorization process — but it eliminates the SSP evidence scramble that typically delays authorization timelines.
Yes. After selecting a baseline (Low, Moderate, or High), you can mark individual controls as not applicable, supplement with additional controls, or document compensating controls. Tailoring decisions are tracked with rationale for assessor review.
Thirdsentry's cross-framework control mapping lets one piece of evidence satisfy multiple framework requirements. A control implementing AC-2 in 800-53 also typically satisfies SOC 2 CC6.1 and ISO 27001 A.5.15 — the platform tracks those mappings so you don't duplicate evidence collection.
See how Thirdsentry automates NIST 800-53 control mapping, evidence collection, and gap analysis — so your team focuses on risk decisions, not compliance overhead.