get_epss_score

THE RISK

Low Risk

Why get_epss_score needs a policy

This tool queries and retrieves existing vulnerability scoring data (EPSS scores) from a security intelligence source without any side effects, modifications, or system state changes. It is purely informational and fits the 'Read' category for data retrieval operations. Low severity due to its read-only nature and lack of blast radius for misuse.

From the tool's definition Tool retrieves EPSS scores from an external database. The description indicates it 'Get[s]' scores with 'cve_ids' as input, which is a read-only query operation that returns pre-computed vulnerability scores. No modification, execution, or deletion occurs.

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

POLICY

How to control get_epss_score

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 get_epss_score:

policy.json

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

get_epss_score 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

More CVE MCP Server tools

Read parse_cvss Parse and explain a CVSS vector string (v2, v3.x, or v4.0). Args: vector: CVS Read calculate_risk_score Calculate a composite 0-100 risk score using CVSS, EPSS, KEV, and PoC data. Read check_exploit_availability Search GitHub for public proof-of-concept (PoC) exploit repositories for a CVE. Result Read check_ip_reputation Check an IP address reputation via AbuseIPDB and GreyNoise Community. Returns abuse co Read check_kev Check if a CVE is in the CISA Known Exploited Vulnerabilities (KEV) catalog. Args: Read check_package_vulns Check a package for known vulnerabilities via OSV.dev. Args: package: Package Read check_poc_exists Search for proof-of-concept exploits across GitHub, Exploit-DB, and Nuclei templates. Read check_ransomware_intel Check if a Bitcoin address is associated with a known ransomware family using the Rans

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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 get_epss_score

What does the get_epss_score tool do? +

Get EPSS (Exploit Prediction Scoring System) scores for one or more CVEs. Args: cve_ids: Comma-separated CVE IDs (e.g. CVE-2021-44228,CVE-2022-22965). 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 get_epss_score? +

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

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

Can I rate-limit get_epss_score? +

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

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

get_epss_score 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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