First Epss MCP Server

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "first-epss-mcp-server": {
      "type": "http",
      "url": "https://first-epss.caseyjhand.com/mcp"
    }
  }
}

5 tools

• epss_get_scores

  Retrieve latest available or historically dated FIRST EPSS probability and percentile for supplied CVEs. Process up to 500 unique entries from batchOffset; response byte limits can return fewer whole entries. Resume with nextBatchOffset as batchOffset, the original cves and…

• epss_get_timeseries

  Retrieve an EPSS anchor and up to 30 preceding daily observations for up to 50 unique CVEs from batchOffset. Response byte limits retain whole history items. Resume CVE batches with nextBatchOffset as batchOffset, the original cves and returned score date as date; withheldCves…

• epss_query_threshold

  Discover CVEs using inclusive EPSS or percentile bounds, CVE year or dataset-addition recency; filters intersect and at least one is required. Examine one candidate page in the upstream FIRST order, which is not ranked by EPSS, so the first page does not hold the highest scores…

• epss_prioritize_cves

  Assign remediation tiers using latest or dated EPSS and caller-supplied CVSS base severity. Defaults are severity >= 7 and EPSS probability >= 0.10; select percentile explicitly for population rank. Missing severity stays in epssOnly and missing EPSS stays unscored. Thresholds…

• epss_list_reference

  Explain FIRST EPSS interpretation, model publishing dates, lookup coverage and transparent prioritization policy. Use this static reference before interpreting missing scores, score movement or probability versus percentile thresholds.

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