smb_share_enum_scan

THE RISK

High Risk

Why smb_share_enum_scan needs a policy

This tool executes active network reconnaissance by running Nmap SMB share enumeration against remote hosts. It is not a passive read — it sends network packets to external systems and triggers SMB protocol interactions.

From the tool's definition 'Scan a network/IP range and enumerate smb shares' — actively probes remote systems using Nmap SMB enumeration scripts against potentially multiple targets

Documented attack patterns abuse exactly the kind of access smb_share_enum_scan gives an agent:

POLICY

How to control smb_share_enum_scan

PolicyLayer is an MCP gateway — it sits between your AI agents and Nmap, and nothing reaches the server without passing your rules. This is the rule we recommend for smb_share_enum_scan:

policy.json

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

smb_share_enum_scan 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.

Create a free account and register Nmap — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 5 Nmap tools →

Execute tools on other servers

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Go deeper

High-risk tools in Nmap → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about smb_share_enum_scan

What does the smb_share_enum_scan tool do? +

Scan a network/IP range and enumerate smb shares. If mulitple targets are provided and they are not in CIDR format, they should be space-separated. It is categorised as a Execute tool in the Nmap MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on smb_share_enum_scan? +

Register the Nmap MCP server in PolicyLayer and add a rule for smb_share_enum_scan: 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 Nmap. Nothing to install.

What risk level is smb_share_enum_scan? +

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

Can I rate-limit smb_share_enum_scan? +

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

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

smb_share_enum_scan is provided by the Nmap MCP server (jarrodcoulter/nmap-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Nmap tool call.

Start from Nmap, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →