Modern information technology (IT) environments move too fast for static inventories to keep up. Unauthorized apps and devices, unmonitored generative artificial intelligence (GenAI) tools, and temporary cloud resources appear faster than they can be documented, often before systems are fully deployed.

These resources remain connected, quietly consuming compute. Forgotten and neglected over time, they become zombie infrastructure: systems still running with no clear owner. In modern environments, these are often called zombie servers, zombie APIs, or orphaned resources. Many originate from abandoned AI workloads.

Gartner predicts that by 2030, 40% of enterprises will experience security or compliance incidents related to “shadow AI” as employees adopt AI tools outside approved oversight. 

In fact, some recent surveys suggest that as many as 90% of enterprise AI systems could be breached within 90 minutes.

The most dangerous system is often the one no one knows exists.

A data scientist may allocate GPUs for model training, or a developer may spin up a temporary service during a migration to bypass slow procurement. These shortcuts may solve problems now but create new ones when they bypass standard asset tracking, landing in personal cloud accounts or sandboxes that never make it into official inventories or workflows.

A widely cited example of shadow AI from the semiconductor industry involved engineers entering proprietary source code and internal meeting notes into ChatGPT while debugging software. Incidents like this show how easily tools adopted outside normal governance can expose sensitive data and create liabilities that may affect revenue, reputation, and compliance.

Industry coverage of AI typically focuses on model safety and output quality, emphasizing what AI might do in the future. It often overlooks the digital clutter that AI experimentation leaves behind in the data center and the observability and security gaps that allow these systems to remain unnoticed.

Agentic AI makes this harder. Autonomous agents interact with other services through API calls, and frameworks such as Model Context Protocol (MCP) allow them to connect dynamically with enterprise systems. When the projects supporting these agents are abandoned, the agents don't stop; they keep running in the background. Researchers are already warning about "Shadow MCP," where unapproved MCP servers allow AI agents to maintain connections to internal tools or sensitive data outside normal governance.

Why Zombie Infrastructure Is Hard to Detect

A S&P Global survey found that organizations abandoned 46 percent of AI proof-of-concepts before they reached production. Traditional monitoring often depends on knowing a system exists before it can be tracked. Asset databases assume infrastructure follows official channels. Shadow systems break that. They're routinely excluded from performance, health, observability pipelines, and security checks, and carry real consequences:

• Systems outside the inventory get missed during patching cycles, leaving them exposed to known exploits and zero-day threats. This isn't a theoretical risk. Unpatched systems are among the most common entry points for lateral movement across the network in enterprise breach investigations.
• Service performance issues become much harder to diagnose when undocumented systems are influencing application behavior, increasing mean time to knowledge (MTTK) and limiting the effectiveness of artificial intelligence for IT operations (AIOps) systems.
• Idle cloud and GPU resources quietly inflate infrastructure costs, burning through budgets set aside for legitimate AI work.
• Undocumented systems storing or processing sensitive data can cause serious problems in General Data Protection Regulation (GDPR), Health Insurance Portability and Accountability Act (HIPAA), or Service Organization Control 2 (SOC 2) audits, and "we didn't know it existed" is not a defense that regulators accept.

AI coding tools now “catch and patch” many flaws before deployment. That improves code quality, but the operational risk sits downstream. Perfectly patched code running on zombie infrastructure, or inside an undocumented agentic workflow, still represents operational blind spots for IT teams. The code is clean, but the infrastructure it lives on is invisible.

What the Network Shows

Infrastructure inventories describe what should exist; network activity reveals what actually exists. Every service and system communicates. Even forgotten resources continue generating traffic and interacting with other services.

Traffic-derived telemetry surfaces systems that traditional monitoring missed. Unknown hosts and persistent connections regularly expose technology operating outside documented inventories. As architectures become more distributed, analyzing network traffic in real time is the most reliable way to restore visibility and understand how services are actually behaving.

The advantage of network traffic as a discovery mechanism is that it requires nothing from the systems being discovered. Agent-based monitoring only sees what it's been installed on. Log aggregation only captures what's been configured to ship logs. But packets traverse the network regardless. A system doesn't need to be documented, enrolled, or even known to generate traffic that can be observed and analyzed. That passive quality is what makes it reliable precisely in the scenarios where everything else fails.

Closing the Gaps with NETSCOUT

Shadow IT and shadow AI allow resources to emerge faster than they can be tracked, leaving forgotten systems and APIs to create serious observability and security gaps. NETSCOUT's proprietary deep packet inspection (DPI) technology turns real-time network traffic into Smart Data, surfacing unknown systems and service dependencies that never made it into official inventories.

Download NETSCOUT’s shadow IT and shadow AI infographic to see how hidden systems and unauthorized AI tools create observability and security gaps across modern IT environments