nxc_winrm · Sec Netexec MCP: Risk & Policy

WHAT IT DOES

What nxc_winrm does on Sec Netexec

AI agents invoke nxc_winrm to trigger actions in Sec Netexec. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why nxc_winrm needs a policy

This tool facilitates arbitrary remote command execution on Windows systems through WinRM. Even with proper authorization, the ability to execute arbitrary commands on remote systems represents a critical risk—a misused invocation could compromise entire systems, escalate privileges, or pivot through infrastructure.

From the tool's definition Tool explicitly enables 'remote Windows management and command execution' via WinRM protocol, with NetExec being a penetration testing framework. The description directly states 'Execute' and 'command execution' capabilities.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

nxc_winrm Rate-limited

nxc_winrm stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "nxc_winrm": {
      "limits": [
        {
          "counter": "nxc_winrm_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Sec Netexec, so you can run agents against it safely.

FAQ

Questions about nxc_winrm

What does the nxc_winrm tool do? +

Execute NetExec WinRM protocol commands for remote Windows management and command execution. It is categorised as a Execute tool in the Sec Netexec MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on nxc_winrm? +

Register the Sec Netexec MCP server in PolicyLayer and add a rule for nxc_winrm: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Sec Netexec. Nothing to install.

What risk level is nxc_winrm? +

nxc_winrm is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit nxc_winrm? +

Yes. Add a rate_limit block to the nxc_winrm rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block nxc_winrm completely? +

Set action: deny in the PolicyLayer policy for nxc_winrm. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides nxc_winrm? +

nxc_winrm is provided by the Sec Netexec MCP server (schwarztim/sec-netexec-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.