check_ip_reputation

ServerCVE MCP Server
CategoryRead

WHAT IT DOES

What check_ip_reputation does on CVE MCP Server

AI agents call check_ip_reputation to retrieve information from CVE MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why check_ip_reputation needs a policy

This tool performs a lookup/query operation against external reputation databases (AbuseIPDB and GreyNoise Community) to retrieve information about an IP address. It retrieves data with no side effects, making it a Read operation. Severity is low because the misuse risk is limited to information gathering; an attacker cannot cause harm by querying IP reputation alone.

From the tool's definition Tool description states it 'Check[s] an IP address reputation' and 'Returns abuse confidence score, country, ISP, Tor status, and noise classification.' The verb is 'check' and 'returns' - indicating a query operation with no modification or execution of…

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

POLICY

How to control check_ip_reputation

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

policy.json

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

check_ip_reputation 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 CVE 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.

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EXPLORE

Related tools and policies

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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 check_ip_reputation

What does the check_ip_reputation tool do? +

Check an IP address reputation via AbuseIPDB and GreyNoise Community. Returns abuse confidence score, country, ISP, Tor status, and noise classification. Args: ip: IPv4 or IPv6 address to check (e.g. 1.2.3.4 or 2001:db8::1). It is categorised as a Read tool in the CVE MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on check_ip_reputation? +

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

What risk level is check_ip_reputation? +

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

Can I rate-limit check_ip_reputation? +

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

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

check_ip_reputation is provided by the CVE MCP Server MCP server (mukul975/cve-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 CVE MCP Server tool call.

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

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27 CVE MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.