FedRAMP Continuous Monitoring

FedRAMP continuous monitoring (ConMon) is the post-authorization operational requirement. It ensures the cloud service continues to meet authorization requirements over time. Without active ConMon, the authorization expires.

ConMon has three pillars:

1. Vulnerability management: Monthly scanning, prioritization, and remediation
2. Configuration management: Tracking changes, security impact analysis, control updates
3. Risk monitoring: Ongoing risk assessment, POA&M maintenance, incident response

FedRAMP publishes a ConMon Strategy Guide and a ConMon Performance Management Guide that detail expectations. Both documents are essential reading for the team operating the FedRAMP program post-authorization.

Reference the FedRAMP framework reference for authorization fundamentals before tackling ConMon details.

Monthly ConMon deliverables:

• Vulnerability scan results: Authenticated scans of all in-scope assets. Results submitted to sponsoring agency in raw format.
• POA&M update: New findings added, closed items removed, timelines updated. POA&M submitted in FedRAMP-required format.
• Inventory of in-scope assets: Updated asset list reflecting any additions, removals, or changes.
• Change request log: Significant changes implemented during the month with security impact analysis.
• Incident report: Any reportable incidents, even if no impact, submitted to FedRAMP and sponsor.

Monthly cadence is non-negotiable. Skipping a month or submitting late triggers escalation with the sponsoring agency. Repeated tardiness can put the authorization at risk.

The first six months post-authorization are typically the hardest. The team is still building the operational rhythm. Build automation for vulnerability scanning and POA&M tracking early to reduce monthly toil.

FedRAMP has specific vulnerability remediation timelines based on severity:

• High vulnerabilities: 30 days from discovery
• Moderate vulnerabilities: 90 days from discovery
• Low vulnerabilities: 180 days from discovery

Failing to remediate within these windows requires:

1. Adding the vulnerability to the POA&M with explanation
2. Documenting compensating controls that mitigate the risk in the interim
3. Providing a realistic remediation date with milestones
4. Risk acceptance from the agency authorizing official if remediation is genuinely infeasible

Track every vulnerability from discovery through remediation. The audit trail (scanner output, ticket, fix verification, re-scan) needs to exist for every Critical and High vulnerability the assessor might sample.

Container and dependency scanning integrate poorly with traditional vulnerability management. If your stack uses containers, build container image scanning into CI/CD and report findings monthly with the standard scan results.

Each year post-authorization, a 3PAO performs an annual security assessment. This is not a full re-authorization but a focused assessment on:

• Changes since the last assessment: New services, modified architecture, control changes
• POA&M progress: Items closed since last year, items still open, new items
• Recurring controls: A subset of controls is tested each year on a rotating basis to ensure ongoing operation
• Incident review: How any incidents during the year were handled

The annual assessment produces an updated SAR. The agency reviews the updated SAR and continues, modifies, or revokes the ATO based on the findings.

Plan annual assessment timing. Schedule it 30-60 days after the anniversary of the original authorization to give time to prepare evidence and resolve any outstanding items. Last-minute scheduling creates pressure and increases the likelihood of findings.

Significant changes require formal review before implementation. FedRAMP defines significant changes broadly:

• New AWS region, Azure region, or other geographic expansion
• New service offering integrated into the authorization boundary
• Architecture changes affecting multiple controls
• New customer types (e.g., expanding from agency-only to public-facing)
• Breach of authorization parameters

The change process:

1. Security impact analysis (SIA): Document the proposed change, the controls it affects, the risk implications, and the mitigation plan
2. Submit to sponsoring agency: Agency reviews the SIA
3. 3PAO assessment of change: Targeted assessment of the changed components
4. Authorization update: Agency formally approves the change and updates the authorization

The cycle takes 60-180 days depending on change scope. Plan major changes accordingly. Trying to deploy a new region in 30 days through this process does not work.