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Cyber ThreatMCP serverFirst audited Nov 13, 2026

io.github.cyanheads/first-epss-mcp-server

Look up FIRST EPSS scores and daily history, find CVEs by threshold, and prioritize them with CVSS.The vendor's description, from its MCP Registry listing.

Passed public checksAudited Nov 13, 2026

Every public check ran and passed. Public audit: we connect as an AI client would, list the tools and check what they say. We do not run them. How we audit

Does it work?
YesConnected in 355 ms.
Sign-up?
None neededIt answered without any account or key.
Can it change things?
No, read-onlyAll 5 tools say they only read.
Endpointhttps://first-epss.caseyjhand.com/mcp

Source code Streamable HTTP · protocol 2025-11-25 · server version 0.2.0

What we checked, the evidence, and the tools it offers.

What we checked

Security

  • Passed: Connections are encrypted (HTTPS).

  • Passed: No hidden instructions found in tool text.

Safety labels

  • Passed: Every tool says whether it only reads or can change things.

Tools

  • Passed: 5 tools listed.

  • Passed: Every tool describes its inputs with a valid schema.

Protocol

  • Passed: The MCP handshake works (Streamable HTTP).

  • Passed: Protocol version 2025-11-25 (latest).

  • Passed: Unknown requests are refused.

Connection

  • Passed: The server responds.

Tools (5)

As the server describes them. The labels are the server's own: it says whether each tool only reads or can change things.

  • epss_get_scoresRetrieve 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…Read-only
  • epss_get_timeseriesRetrieve 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 a…Read-only
  • epss_query_thresholdDiscover 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,…Read-only
  • epss_prioritize_cvesAssign 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.…Read-only
  • epss_list_referenceExplain FIRST EPSS interpretation, model publishing dates, lookup coverage and transparent prioritization policy. Use this static reference before interpreting missing scores, score movement or proba…Read-only

Audit history

  1. Nov 13Passed

What we sent

Every request in this audit, with the answer and how long it took. We never send credentials and never call a tool.

RequestAnswerTime
initializeHTTP 200355 ms
initializedHTTP 202258 ms
tools/listHTTP 200133 ms
resources/listHTTP 200112 ms
prompts/listHTTP 200101 ms
unknown-methodHTTP 200116 ms

Run this server, or disagree with the result?

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