CMMC Ready — CMMC Level 2
90% NIST 800-171 coverage. 2 control gaps identified.
CMMC Status
CMMC Ready
Target Level
Level 2
NIST Coverage
90%
Zscaler Government Cloud
by Zscaler
Overview
Zscaler Government Cloud by Zscaler is a network security solution with FedRAMP authorization targeting CMMC Level 2 compliance. It provides 90% coverage of NIST 800-171 controls for defense contractors handling CUI.
What This Means for Defense Contractors
Zscaler Government Cloud meets the architectural requirements for CMMC Level 2. However, CMMC compliance depends on your entire system boundary — not just individual tools. There are 2 NIST 800-171 control gaps that need remediation before assessment. Defense contractors using Zscaler Government Cloud should verify that their System Security Plan (SSP) documents how this tool fits within their authorization boundary.
NIST 800-171 Coverage
Control Gaps
Using Zscaler Government Cloud without addressing these NIST 800-171 controls may result in findings during a CMMC assessment:
Strengths
Using Zscaler Government Cloud in a CMMC Environment
For defense contractors already using Zscaler Government Cloud, the path to CMMC compliance involves documenting the tool in your System Security Plan (SSP), ensuring proper access controls are configured, and validating that Zscaler Government Cloud's security controls align with your authorization boundary. With 90% NIST 800-171 coverage, Zscaler Government Cloud provides a strong compliance foundation, though the 2 remaining control gaps will need compensating controls or supplementary tools.
CMMC-Ready Network Security Alternatives
CMMC Compliance Analysis for Zscaler Government Cloud
Zscaler Government Cloud demonstrates strong CMMC Level 2 readiness with its FedRAMP authorization and DoD SRG IL4/IL5 support, making it suitable for handling CUI in defense contractor environments. The platform excels in access control (AC), system and communications protection (SC), and audit and accountability (AU) control families through its zero-trust architecture, continuous monitoring, and comprehensive logging capabilities. However, gaps in controls 3.4.1 (information flow enforcement) and 3.4.6 (network communications by exception) present significant challenges. During a C3PAO assessment, evaluators will scrutinize the platform's ability to enforce granular network segmentation and validate that all network communications are explicitly authorized rather than permitted by default. The cloud-native architecture can exist within the CMMC authorization boundary when properly configured with appropriate compensating controls documented in the System Security Plan. Compared to traditional network security solutions like Fortinet FortiGate or Palo Alto Prisma Access, Zscaler Government Cloud's government-specific cloud offering provides superior compliance documentation and FedRAMP inheritance, though it may require additional configuration complexity to address the identified control gaps. The platform's strength lies in its comprehensive security stack integration, but contractors must ensure proper policy configuration to meet CMMC's strict network isolation requirements. C3PAO assessors will particularly focus on validating that the zero-trust model effectively replaces traditional network perimeter controls while maintaining CUI protection standards.
Configuration Guide
To optimize Zscaler Government Cloud for CMMC Level 2 compliance, implement granular network segmentation policies that explicitly deny traffic by default and only permit authorized communications (addressing 3.4.6). Configure custom application control rules to enforce information flow policies between different security domains (addressing 3.4.1). Document these configurations as compensating controls in your SSP, specifically detailing how Zscaler's cloud-delivered security services provide equivalent protection to traditional network boundaries. Enable comprehensive logging and integrate with your SIEM solution to ensure audit trail completeness for network activities. Configure Data Loss Prevention (DLP) policies to monitor and control CUI data flows across network boundaries. Implement user and device-based policies that enforce least privilege access to network resources. Estimated timeline for complete remediation is 8-12 weeks, including policy development, testing, and documentation. Maintain compliance through continuous monitoring using Zscaler's analytics dashboard and automated compliance reporting features. Prepare evidence including policy configurations, traffic flow diagrams, security event logs, and administrative access records for C3PAO review. Regular policy validation and testing should be conducted quarterly to ensure ongoing effectiveness. Document all deviations and exceptions in your POA&M with specific timelines for resolution.
Configuration Checklist
- 1ISSO: Configure default-deny network policies in Zscaler admin console to address NIST 3.4.6 requirements
- 2Sysadmin: Implement granular application control rules for CUI data flow enforcement per NIST 3.4.1
- 3ISSO: Document compensating controls in SSP Section 3.4 explaining how cloud-delivered security replaces traditional network boundaries
- 4Sysadmin: Enable comprehensive audit logging and integrate with organizational SIEM for SC-7 compliance
- 5ISSO: Configure Data Loss Prevention policies to monitor and control CUI across network boundaries
- 6Sysadmin: Establish user and device-based access policies implementing least privilege network access
- 7ISSO: Create POA&M entries for identified control gaps with specific remediation timelines and responsible parties
- 8C3PAO: Validate network segmentation effectiveness through penetration testing and traffic analysis
- 9ISSO: Conduct quarterly policy validation reviews and document results for continuous monitoring evidence
- 10Contracts: Ensure Zscaler Government Cloud contract includes required compliance reporting and audit support provisions
Related Compliance Assessments
Frequently Asked Questions
Is Zscaler Government Cloud CMMC compliant?
Zscaler Government Cloud meets CMMC Level 2 requirements with 90% NIST 800-171 control coverage.
What NIST 800-171 controls does Zscaler Government Cloud cover?
Zscaler Government Cloud covers 90% of the 110 NIST 800-171 controls, with 2 gaps primarily in 3.4.1 and 3.4.6 control families.
What are the CMMC compliance gaps for Zscaler Government Cloud?
The primary gaps are in controls 3.4.1, 3.4.6. These require supplementary tools or process controls to achieve full CMMC Level 2 compliance.
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