The Problem with Cloud AI and CUI
Controlled Unclassified Information (CUI) cannot leave your organization's control boundary without explicit authorization. Cloud-based AI tools — ChatGPT, Microsoft Copilot, Google Gemini, Claude.ai — are not within your control boundary. They are external services operated by third parties.
When an employee pastes a DoD contract number, technical spec, or personnel record into a cloud AI prompt, that data is transmitted to and processed on external servers. This is a direct violation of NIST 800-171 control 3.13.1 (boundary protection).
Which AI Tools Create CMMC Risk
- ChatGPT (OpenAI): All tiers, including Team and Enterprise, route prompts through OpenAI infrastructure
- Microsoft Copilot: Even M365 Copilot with "data privacy" settings can still process data on Microsoft's servers
- Google Gemini / Workspace AI: Same issue — Google's servers, not yours
- Claude.ai (Anthropic): The web interface sends data to Anthropic's infrastructure
- GitHub Copilot: Code suggestions involving CUI-related identifiers can expose data
What "Local-Only" Actually Means
The only CMMC-compliant way to use AI is through a local-only proxy that intercepts prompts before they reach any external service, scans for CUI markers, and either blocks the request or strips the sensitive content.
HoundShield works as a drop-in proxy: your AI tools point to our local endpoint instead of the cloud AI API. Sub-10ms scanning. Zero data leaves your network. Every scan creates a tamper-evident log entry your C3PAO can review.