FedRAMP Acronyms: The Complete Glossary

FedRAMP runs on acronyms, and the new FedRAMP - the 20x modernization and the 2026 Consolidated Rules - just added a whole fresh batch of them. If you have found yourself asking what KSI, VDR, VER, or PAIN actually mean, this is the plain-English glossary for you. We have split it into the new FedRAMP 20x acronyms first (the ones sending people to search engines right now), then the classic FedRAMP acronyms every authorization package uses, and finally the standards and agencies you will see referenced. Definitions are checked against FedRAMP’s own 2026 Consolidated Rules.

The new FedRAMP 20x acronyms

FedRAMP 20x moves authorization away from heavy narrative documents toward automation, machine-readable evidence, and validated technical indicators. That shift brought a new vocabulary.

FedRAMP 20x - the 2024-2026 modernization of the program. Where classic FedRAMP leaned on document review, 20x leans on automation, machine-readable evidence, and validated indicators, with a single “FedRAMP Authorized” designation replacing the old tiers.

RFC - Request for Comments. FedRAMP now drafts its rules in the open as numbered RFCs and collects public feedback before finalizing. If you see a citation like RFC-0005 (assessment scope), RFC-0006 and RFC-0014 (Key Security Indicators), or RFC-0012 (vulnerability response), that is the 20x rulemaking process at work.

KSI - Key Security Indicators. The building blocks of 20x. KSIs are concise, testable statements of the security capabilities a cloud service must demonstrate, mapped back to NIST SP 800-53. Instead of narrating a control across pages, you prove the indicator with evidence.

MAS - Minimum Assessment Scope (Standard). Defines the minimum set of a cloud service’s components and boundary that must be assessed. It renamed the older “Scope of FedRAMP” wording to avoid confusion, and it is validated primarily through the KSIs.

VDR - Vulnerability Detection and Response. The 20x replacement for the legacy scan-and-remediate model. VDR covers how a provider persistently discovers vulnerabilities - and detection is defined broadly, including threat intelligence, disclosure programs, bug bounties, penetration testing, and more, not just scanning - and how promptly it responds. (We cover this in depth in how FedRAMP VDR and VER replace CVSS-based scanning.)

VER - Vulnerability Evaluation and Reporting. The evaluation-and-reporting rules carved out of VDR into their own ruleset for convenience. VER covers how you rate a vulnerability’s risk (the PAIN rating), the rules for accepted vulnerabilities, and structured reporting.

PAIN - Potential Agency Impact N-rating. The contextual impact rating at the heart of VER: the estimated cumulative effect on agencies if a vulnerability were exploited. PAIN, combined with internet-reachability and exploitability, drives remediation timeframes - replacing the flat, CVSS-driven 30/90/180-day windows of the old model.

IRV - Internet-Reachable Vulnerability. A vulnerability on a resource that could be reached by an attack originating from the public internet. Reachability is a primary driver of priority under VDR - an internet-facing weakness outranks the same weakness buried behind isolation.

LEV - Likely Exploitable Vulnerability. A vulnerability that is not fully mitigated, is reachable by threat actors, and is likely to cause unauthorized access or harm if exploited.

KEV - Known Exploited Vulnerability. Any vulnerability listed in CISA’s Known Exploited Vulnerabilities catalog - the authoritative signal that a weakness is being actively exploited in the wild. FedRAMP’s vulnerability rules lean on the KEV catalog heavily.

SDR - Security Decision Record. A persistently maintained record of the security decisions made over a cloud service offering’s lifecycle - the audit trail of why things are the way they are.

OCR - Ongoing Certification Report. The regular report a FedRAMP Certified provider supplies to its agency customers to evidence continued compliance.

IIR / FIR / OIR - Initial / Final / Ongoing Incident Report. The structured incident reports a provider supplies to FedRAMP and agency customers: the initial report when an incident is identified, ongoing reports while it is active, and the final report after recovery.

OSCAL - Open Security Controls Assessment Language. NIST’s machine-readable format for control catalogs, System Security Plans, assessment plans and results, and POA&Ms. The automation ambitions of 20x run on OSCAL, which is why converting your package to OSCAL is increasingly the price of entry. (It is also what our platform, OscalIQ, is built around.)

The classic FedRAMP acronyms

These are the terms that have anchored FedRAMP packages for over a decade. They are not going away under 20x.

FedRAMP - Federal Risk and Authorization Management Program. The U.S. government program that standardizes security assessment, authorization, and continuous monitoring for cloud products used by federal agencies. The pitch: assess once, reuse many times.

CSP - Cloud Service Provider. The company offering the cloud product being authorized.

CSO - Cloud Service Offering. The specific product or service being authorized. A single CSP can have several distinct CSOs.

3PAO - Third Party Assessment Organization. The accredited, independent assessor that tests a cloud service against FedRAMP requirements. Think of it as the external auditor.

ATO - Authority to Operate. An agency’s formal decision to accept the risk of using a system. It is the goal the entire process builds toward.

P-ATO - Provisional Authority to Operate. The authorization the now-retired Joint Authorization Board used to issue, which agencies then leveraged. Being folded into the single “FedRAMP Authorized” designation.

JAB - Joint Authorization Board. The former GSA/DoD/DHS board that granted P-ATOs. Under “One FedRAMP Authorization,” the JAB and Agency tiers are being consolidated into a single designation, and its continuous-monitoring duties moved to agencies or to FedRAMP.

PMO - Program Management Office. The FedRAMP PMO, housed at GSA, that runs the program.

AO - Authorizing Official. The agency official who signs the ATO and formally owns the residual risk of operating the system.

ISSO - Information System Security Officer. The person responsible for a system’s day-to-day security posture.

SSP - System Security Plan. The cornerstone document: it describes the system, its boundary, and how each security control is implemented.

SAP - Security Assessment Plan. The 3PAO’s plan for how it will test the system.

SAR - Security Assessment Report. The 3PAO’s report of what its testing found.

POA&M - Plan of Action and Milestones. The living tracker of open weaknesses and how and when they will be remediated. This is the document VDR/VER most directly reshapes.

ConMon - Continuous Monitoring. The ongoing obligation after authorization: recurring scans, POA&M upkeep, and significant-change reporting. Security is a subscription, not a purchase.

RAR - Readiness Assessment Report. An early 3PAO attestation that a cloud service is ready to pursue authorization, which leads to the “FedRAMP Ready” designation.

CIS / CRM - Control Implementation Summary / Customer Responsibility Matrix. The artifacts that spell out who is responsible for each control: the provider, the customer, or a shared responsibility.

SRTM - Security Requirements Traceability Matrix. Maps security requirements to the specific controls that satisfy them.

SBOM - Software Bill of Materials. The inventory of components and dependencies inside the software - increasingly required for supply-chain transparency.

CUI - Controlled Unclassified Information. Sensitive-but-unclassified federal data whose protection drives many of the requirements.

LI-SaaS - Low-Impact Software-as-a-Service. The FedRAMP Tailored path for low-risk SaaS, with a reduced control set.

Standards and agencies you will see referenced

NIST - National Institute of Standards and Technology. Publishes the standards FedRAMP is built on.

SP - Special Publication. NIST’s document series. SP 800-53 is the control catalog FedRAMP uses; SP 800-171 covers CUI in non-federal systems.

Rev5 - Revision 5. The current revision of NIST SP 800-53, and the FedRAMP control baseline.

FIPS - Federal Information Processing Standards. FIPS 199 sets the Low / Moderate / High impact categorization for a system; FIPS 140 validates cryptographic modules.

OMB - Office of Management and Budget. Issued memo M-24-15, which set the modernization of FedRAMP in motion.

CISA - Cybersecurity and Infrastructure Security Agency. Maintains the KEV catalog and issues binding operational directives that FedRAMP aligns to.

GSA - General Services Administration. The agency that houses the FedRAMP PMO.

Why the new acronyms matter

The 20x vocabulary is not just renaming. KSIs change how you prove security (evidence, not narrative). VDR, VER, PAIN, IRV, and LEV change how you prioritize vulnerabilities (context and exploitability, not raw CVSS). And OSCAL changes how you deliver the whole package (structured data, not spreadsheets). If your team is still fluent only in the classic acronyms, the new ones are the study list.

Getting ready for the new FedRAMP is exactly what we help with. If you want your SSP, KSIs, and POA&M in OSCAL - and your vulnerabilities evaluated the VDR way, by exploitability and reachability rather than CVSS - take a look at OscalIQ or get in touch.