masscan · PenTest MCP Server MCP: Risk & Policy

WHAT IT DOES

What masscan does on PenTest MCP Server

AI agents invoke masscan to trigger actions in PenTest MCP Server. 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 masscan needs a policy

masscan is a high-speed network port scanner that executes active network reconnaissance by sending packets to potentially thousands of hosts. While classified as Execute (not Destructive), it can trigger security alerts, violate terms of service, and constitute unauthorized access if misused against systems without permission.

From the tool's definition Fast port scanner — actively sends network packets to scan ports on target systems

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

masscan Rate-limited

masscan 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": {
    "masscan": {
      "limits": [
        {
          "counter": "masscan_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 PenTest MCP Server, so you can run agents against it safely.

FAQ

Questions about masscan

What does the masscan tool do? +

Fast port scanner. It is categorised as a Execute tool in the PenTest MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on masscan? +

Register the PenTest MCP Server MCP server in PolicyLayer and add a rule for masscan: 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 PenTest MCP Server. Nothing to install.

What risk level is masscan? +

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

Can I rate-limit masscan? +

Yes. Add a rate_limit block to the masscan 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 masscan completely? +

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

masscan is provided by the PenTest MCP Server MCP server (mohitsahoo/mcptoolforwebvulnerabilities-). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.