router_prefix_list_list

THE RISK

Low Risk

Why router_prefix_list_list needs a policy

This tool retrieves and queries IPv4 prefix list data without side effects. It is purely informational, used for viewing route filtering configuration. No data is created, modified, deleted, or executed. It falls squarely into the Read category with low severity due to the limited blast radius of accessing routing configuration metadata.

From the tool's definition Tool name contains 'list' and description states 'List all IPv4 prefix lists' with no modification or execution implied.

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

POLICY

How to control router_prefix_list_list

PolicyLayer is an MCP gateway — it sits between your AI agents and FortiOS 7 6 X MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for router_prefix_list_list:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "router_prefix_list_list": {}
  }
}

router_prefix_list_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register FortiOS 7 6 X MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about router_prefix_list_list

What does the router_prefix_list_list tool do? +

List all IPv4 prefix lists (used in route filtering). It is categorised as a Read tool in the FortiOS 7 6 X MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on router_prefix_list_list? +

Register the FortiOS 7 6 X MCP Server MCP server in PolicyLayer and add a rule for router_prefix_list_list: 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 FortiOS 7 6 X MCP Server. Nothing to install.

What risk level is router_prefix_list_list? +

router_prefix_list_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit router_prefix_list_list? +

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

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

router_prefix_list_list is provided by the FortiOS 7 6 X MCP Server MCP server (paoloamato2/fortinet-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 FortiOS 7 6 X MCP Server tool call.

Start from FortiOS 7 6 X MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →