Tenable.io
by Tenable
Covered
10
controls
Partial
2
controls
Gaps
3
controls
Overview
Tenable.io by Tenable is a vulnerability management solution that covers 10 NIST 800-171 controls (9% total coverage). It addresses key requirements in the vulnerability management domain for defense contractors pursuing CMMC compliance.
Controls Covered (10)
Implementation Notes
Deploy Tenable.io with FIPS-validated configurations. Integrate with your SIEM for centralized audit logging. Review partial controls quarterly to identify supplementary tooling needs.
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Implementation Guidance for Tenable.io
Configure Tenable.io for NIST 800-171 compliance by establishing automated vulnerability scanning across all network segments. For RA-5 (Vulnerability Scanning), configure authenticated scans using domain service accounts with read-only privileges, schedule weekly internal scans and daily external scans of internet-facing assets. Set vulnerability severity thresholds aligned with organizational risk tolerance - typically Critical/High vulnerabilities require remediation within 15/30 days respectively. For SI-2 (Flaw Remediation), integrate Tenable.io with patch management systems via API to automatically create tickets for identified vulnerabilities. Configure custom dashboards showing patch compliance rates and vulnerability trending metrics. For CM-6 (Configuration Settings), leverage Tenable.io's compliance scanning capabilities using DISA STIGs and CIS benchmarks as baseline configurations. Generate evidence through automated reporting - create monthly executive dashboards, weekly operational reports, and on-demand compliance reports for C3PAO assessments. Integrate with SIEM solutions like Splunk or QRadar using Tenable.io's REST API to correlate vulnerability data with security events. Common misconfigurations include: scanning with excessive privileges (violate least privilege), inadequate network segmentation allowing scanner access to sensitive systems, failing to configure custom compliance policies for contractor-specific requirements, and not establishing proper scan scheduling to avoid business disruption. Ensure scan credentials are rotated quarterly and stored in approved credential vaults.
Gap Analysis & Compensating Controls
Tenable.io's 9% coverage leaves significant gaps in critical NIST 800-171 control families. The largest gaps exist in Access Control (AC) family, requiring additional identity management solutions like CyberArk or Okta for AC-2 (Account Management) and AC-3 (Access Enforcement). Incident Response (IR) controls are not addressed, necessitating dedicated SIEM/SOAR platforms like Splunk Phantom or IBM QRadar SOAR for IR-4 (Incident Handling) and IR-6 (Incident Reporting). System and Communications Protection (SC) gaps require network security tools like Palo Alto Networks firewalls or Cisco ASA for SC-7 (Boundary Protection). For SSP documentation, clearly define Tenable.io's role as the primary vulnerability assessment tool while identifying compensating controls through existing infrastructure. Document POA&M items for missing controls with realistic timelines - prioritize Access Control gaps (30-60 days) due to high CMMC assessment weight, followed by Incident Response capabilities (60-90 days) and boundary protection enhancements (90-120 days). Consider hybrid approaches where possible - leverage existing Active Directory for some AC controls while planning dedicated IAM solution procurement. Establish clear control inheritance relationships between Tenable.io and compensating tools to avoid assessment confusion.
Compliance Cost Estimate
Tenable.io licensing ranges from $3,000-$4,500 per year for small defense contractors (50-100 assets) to $15,000-$25,000 annually for mid-size organizations (500-1,000 assets). Implementation costs include 40-60 hours of professional services ($8,000-$12,000) for initial configuration, policy customization, and integration setup. Ongoing monitoring requires 0.25-0.5 FTE annually ($20,000-$40,000) for scan management, report generation, and vulnerability tracking. Compared to competitors like Rapid7 InsightVM or Qualys VMDR, Tenable.io offers competitive pricing with superior reporting capabilities essential for C3PAO assessments. Total three-year cost of ownership typically ranges $45,000-$95,000 depending on organization size, making it cost-effective versus building internal vulnerability management capabilities requiring dedicated staff and multiple point solutions.
Compliance Cross-References
Tenable.io directly supports DFARS 252.204-7012 requirements for vulnerability assessment and system monitoring, particularly addressing the mandate for continuous monitoring capabilities. For CMMC Level 2, it satisfies assessment objectives in Risk Assessment (RA.2.138 vulnerability scans, RA.2.139 remediation tracking) and System and Information Integrity (SI.2.212 flaw remediation, SI.2.214 security alert monitoring). The solution aligns with FedRAMP Moderate baseline controls including RA-5 (Vulnerability Scanning), SI-2 (Flaw Remediation), and CA-2 (Security Assessments) through automated scanning and compliance reporting features. CMMC assessors recognize Tenable.io's compliance scanning for configuration management objectives, though additional tools are required for access control and incident response domains. The platform's FedRAMP authorization provides inherent compliance benefits for contractors requiring authorized cloud services. Integration with FedRAMP-authorized SIEM solutions creates a compliance-friendly vulnerability management ecosystem supporting both NIST 800-171 and CMMC Level 2 requirements while maintaining appropriate security boundaries.
Frequently Asked Questions
How many NIST 800-171 controls does Tenable.io cover?
Tenable.io covers 10 of 110 NIST 800-171 controls (9%), with 2 partially covered and 3 gaps.
Can Tenable.io alone satisfy CMMC Level 2?
No single tool covers all 110 NIST 800-171 controls. Tenable.io covers 9% and should be part of a layered security stack addressing the remaining controls.
What controls does Tenable.io not cover?
Tenable.io does not cover controls mp-3-8-1, ia-3-5-1, pe-3-10-1. These require supplementary solutions such as physical security controls, additional access management, or media protection tools.
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