nxc_mssql · Sec Netexec MCP: Risk & Policy

WHAT IT DOES

What nxc_mssql does on Sec Netexec

AI agents invoke nxc_mssql 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_mssql needs a policy

This tool enables execution of arbitrary commands against SQL Server instances via the MSSQL protocol. Even if framed as 'enumeration,' the explicit mention of 'command execution' means an AI agent could run malicious SQL commands, extract sensitive data, modify database contents, or pivot to other systems.

From the tool's definition Tool description states 'Execute NetExec MSSQL protocol commands for SQL Server enumeration and command execution.' The word 'Execute' directly indicates code/command execution capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

nxc_mssql Rate-limited

nxc_mssql 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_mssql": {
      "limits": [
        {
          "counter": "nxc_mssql_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_mssql

What does the nxc_mssql tool do? +

Execute NetExec MSSQL protocol commands for SQL Server enumeration 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_mssql? +

Register the Sec Netexec MCP server in PolicyLayer and add a rule for nxc_mssql: 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_mssql? +

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

Can I rate-limit nxc_mssql? +

Yes. Add a rate_limit block to the nxc_mssql 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_mssql completely? +

Set action: deny in the PolicyLayer policy for nxc_mssql. 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_mssql? +

nxc_mssql 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.