FedRAMP Vulnerability Management: Scanning Requirements, SLAs, and Continuous Monitoring

FedRAMP (Federal Risk and Authorization Management Program) governs how cloud service providers (CSPs) can sell to US federal agencies. It's built on NIST SP 800-53 controls, with FedRAMP-specific interpretations and supplemental guidance that tighten many requirements beyond the NIST baseline. Vulnerability management under FedRAMP is specifically governed by RA-5 (Vulnerability Monitoring and Scanning) and the continuous monitoring (ConMon) program requirements.

If you're pursuing FedRAMP authorization or maintaining an existing ATO (Authority to Operate), your vulnerability management program must meet specific, documented requirements, not just "best practices." This post covers exactly what those requirements are.

RA-5 (Vulnerability Monitoring and Scanning): The Control Requirements

RA-5 in NIST SP 800-53 Rev 5 has several base requirements plus numerous enhancement controls. FedRAMP mandates specific enhancement controls based on impact level (Low, Moderate, High).

The base RA-5 control requires organizations to:

1. Monitor and scan for vulnerabilities in the system and hosted applications
2. Employ vulnerability monitoring tools and techniques that facilitate interoperability
3. Analyze vulnerability scan reports and results
4. Remediate legitimate vulnerabilities within organizationally-defined timeframes
5. Share information obtained from the vulnerability monitoring process with designated personnel

FedRAMP adds specific parameters to each of these requirements. The critical ones for a VM program:

Scan Frequency Requirements by Impact Level

For Moderate and High impact systems, which represent the vast majority of federal cloud workloads, monthly scanning is the mandatory minimum. The FedRAMP ConMon Guide further specifies that scan results must be submitted to the JAB or authorizing agency as part of monthly ConMon deliverables. This means missed scans aren't just a control gap; they create a ConMon deliverable gap that can result in remediation action or ATO suspension.

FedRAMP does not accept quarterly scanning for Moderate or High systems as of the Rev 5 transition. If your SSP still shows quarterly scanning for a Moderate authorization, update it before your next annual assessment.

CVSS-Based Remediation SLA Requirements

FedRAMP's remediation SLAs are based on CVSS scores and are non-negotiable. Unlike SOC 2, where you set your own SLA and must meet it, FedRAMP sets the SLA for you:

Note that for High impact systems, Critical and High severity CVEs both carry a 30-day SLA. This is significantly more aggressive than what most organizations implement in their internal programs. If your High impact system has a 90-day SLA for CVSS High findings, you're out of compliance with FedRAMP requirements.

Plan of Action and Milestones (POA&M) Documentation

Any vulnerability that cannot be remediated within its SLA must be tracked in a POA&M. The POA&M is a living document submitted monthly as part of ConMon deliverables. Each entry must contain:

• Unique POA&M ID: sequential identifier for tracking
• Weakness name/description: the CVE ID and human-readable description
• Detection source: which scan tool and scan date identified the finding
• Date identified: from the scan result, not triage date
• Scheduled completion date: your target remediation date (must be within SLA, or extended with justification)
• Milestones with completion dates: intermediate steps (e.g., patch testing, change window, deployment)
• Risk adjustment: documented operational/technical reason if requesting an extension
• Resources required: who owns remediation
• Status: Ongoing, Completed, Risk Accepted, False Positive
• CVSS score and severity: from NVD

The POA&M is typically maintained in the FedRAMP-provided Excel template or an equivalent tool. Each month, you update status, close completed items, add new findings that missed SLA, and adjust milestones. The 3PAO reviews the POA&M during the annual assessment to verify that items are being actively pursued.

ConMon Reports: Monthly Deliverable Requirements

Continuous Monitoring (ConMon) deliverables are submitted monthly to your authorizing agency (or the JAB, for JAB-authorized systems). The vulnerability management components of ConMon deliverables include:

1. Vulnerability scan results: raw scanner output (Nessus, Qualys, etc.) for all in-scope systems, in an approved format. Some agencies require specific scanner output formats; check your ATO conditions.
2. Updated POA&M: the full POA&M workbook with all current items and status updates.
3. Inventory update: updated hardware and software inventory confirming scan coverage.
4. Penetration test results (annually), for the annual assessment, not monthly, but tracked in the ConMon program.
5. Security impact analysis: for any changes to the system boundary that might introduce new vulnerabilities.

CSP vs. 3PAO Responsibilities

A common confusion point: what does the CSP (Cloud Service Provider) own, and what does the 3PAO (Third-Party Assessment Organization) test?

CSP Responsibilities (Ongoing)

• Running vulnerability scans on the defined monthly schedule
• Maintaining and updating the POA&M
• Submitting monthly ConMon deliverables on time
• Remediating vulnerabilities within SLA or documenting POA&M items
• Maintaining system inventory accuracy for scan coverage
• Implementing and documenting compensating controls for items that cannot be patched

3PAO Responsibilities (Annual + Ad Hoc)

• Annual assessment of control effectiveness, verifying that RA-5 operated as documented throughout the year
• Independent penetration testing (minimum annually for Moderate; more frequent for High)
• Reviewing POA&M for completeness and appropriate risk acceptance
• Verifying that scan coverage matches the authorized system boundary
• Sampling vulnerability findings against remediation evidence to verify actual closure

Practical Implementation: FedRAMP-Ready Vulnerability Management Stack

A FedRAMP-compliant vulnerability management program for a Moderate authorization typically looks like:

Monthly Scan Schedule:
 Week 1: OS/Infrastructure scan (all in-scope servers, VMs, containers)
 Week 2: Web application scan (all in-scope web endpoints)
 Week 3: Database scan (all in-scope database instances)
 Week 4: Review results, update POA&M, prepare ConMon deliverables

Tooling Minimum:
 OS/Infra scanner: Nessus Professional, Qualys VMDR, or Tenable.io
 Web app scanner:  Burp Suite Pro, OWASP ZAP, or Qualys WAS
 Database scanner: Nessus (has DB plugins) or McAfee Database Security

Evidence Artifacts:
 - Scanner export: dated, in XML/CSV, showing all findings
 - Coverage report: showing all in-scope IPs/hosts were scanned
 - POA&M workbook: updated with new findings and status changes
 - Remediation evidence: re-scan showing CVE no longer present,
  or ticket showing patch applied with date