Threat intelligence for FedRAMP: ConMon, SI-5, and the cost

FedRAMP authorisation is implementation of the NIST 800-53 Rev 5 control set tailored for the appropriate impact level (Low, Moderate, High, or LI-SaaS). A CTI programme contributes evidence to seven 800-53 controls primarily in the SI (System and Information Integrity), RA (Risk Assessment), and IR (Incident Response) families. The mapping is the same for FedRAMP and StateRAMP, with depth differences at High versus Moderate.

Source: NIST SP 800-53 Rev 5 (September 2020, errata through 2024), FedRAMP Moderate and High baseline (FedRAMP Rev 5 baselines, released May 2023, in steady-state use as of 2026).

Control SI-5 in NIST 800-53 Rev 5 reads, in essence: receive system security alerts, advisories, and directives from designated external organisations on an ongoing basis. The control enhancement SI-5(1) for High systems adds automated mechanisms for distribution. This is the closest the FedRAMP control catalogue comes to requiring a threat intelligence feed.

The designated external organisations clause has a defined floor: CISA, US-CERT, NIST NVD, the relevant sector ISAC. For systems serving federal civilian agencies, CISA Automated Indicator Sharing (AIS) is the most common implementation. For systems serving DoD components, Joint Cyber Defense Collaborative (JCDC) and the appropriate Cyber Mission Force advisory channels apply. For systems serving intelligence community customers, additional cleared-personnel feed handling applies and is out of scope for unclassified FedRAMP authorisation.

For a 3PAO assessor, SI-5 evidence consists of three things: the documented list of external sources you receive alerts from, the ingestion mechanism for each, and a sample of recent alerts the team acted on. The list is in your System Security Plan (SSP) under SI-5 implementation; the mechanism is documented in the architecture diagram and operational procedures; the sample alerts come out of the case management system or change records. Three samples within the past quarter is the practical floor; six or more makes for a smoother assessment.

For depth beyond CISA AIS at FedRAMP Moderate, commercial feeds add curated actor profiles, dark-web monitoring, and brand-protect coverage. The FedRAMP-authorised options in 2026 are Recorded Future (Moderate), Mandiant Advantage via Google Cloud Public Sector, Microsoft Defender Threat Intelligence via Azure Government (High), and CrowdStrike Falcon with adversary intelligence via GovCloud (High).

FedRAMP Continuous Monitoring requires monthly deliverables to the agency or sponsor. The deliverables touching CTI are the vulnerability scan summary (RA-5 evidence), the POA&M update (open issues with target remediation dates), and the incident summary for any incidents in scope. The CTI programme feeds two of these directly.

Vulnerability prioritisation is the cleanest CTI contribution. A monthly scan from Tenable.io, Qualys, or Rapid7 InsightVM produces hundreds to thousands of findings; without prioritisation, the POA&M becomes unmanageable. CTI inputs into prioritisation include EPSS (Exploit Prediction Scoring System) scores, CISA Known Exploited Vulnerabilities catalogue, and vendor-specific exploitation telemetry from Recorded Future, Mandiant, or CrowdStrike. The defensible POA&M shows reasoning for each priority assignment, with intel-source attribution.

For incident reporting under IR-6, FedRAMP requires notification to the agency within timelines defined per the PMO; for High systems, the JCDC and CISA reporting timelines apply. The CTI programme contributes to detection that an incident occurred and to attribution that supports the IR-6 report. Agency security teams are increasingly probing the quality of detection narrative in incident summaries; "the SIEM flagged it" is thinner evidence than "the SIEM flagged an outbound connection to a known APT-29 C2 IP from our Recorded Future feed, confirmed via Falcon endpoint logs."

For vulnerability prioritisation more deeply, see AI vulnerability prioritisation. The patterns described there map onto RA-5 ConMon evidence directly.

Two stack patterns cover most FedRAMP Moderate and High deployments in 2026. The choice depends on your existing infrastructure provider and the agency expectations for your boundary.

For full FedRAMP audit cost ranges including 3PAO assessment fees, agency sponsorship costs, and ConMon overhead, see fedrampcost.com.

A composite of typical 3PAO assessment questions for the SI, RA, and IR control families that touch CTI. Drawn from publicly available 3PAO assessment methodology documents and the FedRAMP PMO control implementation guidance.

1. Q1.Walk me through the SI-5 implementation. Which external sources do you receive security alerts and advisories from?
2. Q2.Show me how a new advisory from CISA reaches the operations team. What is the latency from publication to action?
3. Q3.For SI-4, show me three detection rules and the intelligence sources that informed them.
4. Q4.For RA-5, show me how vulnerability scan findings are prioritised. What CTI inputs go into prioritisation?
5. Q5.For IR-4, show me the IR playbook for a credential compromise scenario. Where does it reference intelligence sources?
6. Q6.If a high-severity advisory comes in over a weekend, how does it reach the on-call analyst?
7. Q7.What is your fallback if your primary commercial feed goes offline?
8. Q8.For agency systems with FOIA exposure, how is intelligence source sensitivity handled in the SSP?
9. Q9.Show me the last quarterly review of your CTI feed inventory. What changed in the past year?
10. Q10.Do you use LLMs or AI to enrich threat intelligence? Where is the human review gate, and how is the audit trail preserved?