parse_cvss

THE RISK

Low Risk

Why parse_cvss needs a policy

This tool only parses and interprets an input string locally, returning structured information about CVSS metrics. It performs no external calls, writes no data, and has no side effects. Misuse potential is minimal.

From the tool's definition Parse and explain a CVSS vector string

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

POLICY

How to control parse_cvss

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 parse_cvss:

policy.json

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

parse_cvss 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.

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 →
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FAQ

Questions about parse_cvss

What does the parse_cvss tool do? +

Parse and explain a CVSS vector string (v2, v3.x, or v4.0). Args: vector: CVSS vector string (e.g. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). 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 parse_cvss? +

Register the CVE MCP Server MCP server in PolicyLayer and add a rule for parse_cvss: 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 parse_cvss? +

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

Can I rate-limit parse_cvss? +

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

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

parse_cvss 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.

CHECK YOUR STACK →