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CVE Lookup with CVSS, EPSS, and CISA KEV
x402
CVE Lookup with CVSS, EPSS, and CISA KEV is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).
Look up CVE vulnerability details by ID or keyword, enriched with CVSS scores, EPSS exploitation probability, and CISA Known Exploited Vulnerabilities catalog status.
Price / call$0.005
Success—
StatusUnknown
How this service works
Look up a CVE by id, or search CVEs by keyword or product: the NVD description, CVSS severity and vector (v4.0, v3.1, v2), CWE weaknesses, affected products and versions (CPE), and reference links, joined with the EPSS exploitation probability (next 30 days) and whether CISA lists it as a known exploited vulnerability (date added, due date, ransomware use). This product uses the NVD API but is not endorsed or certified by the NVD.
Output
Returns a JSON object with matched CVE records including: CVE ID, CVSS v2/v3.1/v4.0 scores and vectors, severity rating, CWE classifications, EPSS exploitation probability and percentile, CISA KEV catalog membership status, list of affected products with CPE strings, publication and last-modified dates, NVD URL, and reference links. Also includes data source attribution for NVD, KEV, and EPSS.
Example use cases
Patch prioritization by exploitability
“I need to triage our open vulnerabilities — look up CVE-2021-44228 and tell me its CVSS score, whether it's in the CISA KEV catalog, and what the EPSS exploitation probability is so I can decide how urgently to patch it.”
Vulnerability research by keyword
“Search for CVEs related to 'openssl heap overflow' — return up to 10 results with their CVSS severity and EPSS scores so I can see which ones are most likely to be exploited.”
Security report enrichment for a CVE
“Pull the full details on CVE-2023-44487, including CVSS vector, severity, affected products and versions, EPSS percentile, and whether CISA has flagged it as a known exploited vulnerability.”
Technical details
Endpoint
POSThttps://agent402.tools/api/cve-lookup?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need enriched, structured CVE intelligence in a single call — specifically when you want NVD vulnerability data combined with EPSS exploitation probability and CISA KEV status without building multiple API integrations. Ideal for security triage workflows, patch prioritization, compliance checks, and automated vulnerability reporting. Prefer over raw NVD API calls when you want EPSS and KEV data joined automatically. No signup or API key required — pay $0.005 USDC per call via x402.
Side effects
- CVE ID not found in NVD — returns matched:0 with empty results array
- Invalid CVE format — may return validation error or zero results
- Keyword too short (under 3 chars) or too long (over 100 chars) — input validation error
- Neither cve nor keyword provided — missing required field error
- EPSS or KEV data temporarily unavailable — available flag set to false in respective sub-object
- Payment not received via x402 — 402 Payment Required response before results are returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cve | string | A CVE id, e.g. CVE-2024-3094. Give this or keyword. |
| kev | boolean | Join the CISA KEV catalog entry (default true). |
| epss | boolean | Join the EPSS exploitation probability (default true). |
| limit | integer | Keyword search: records to return, 1 to 20 (default 5). |
| keyword | string | Words to search CVE descriptions for, e.g. "openssl heap overflow" (3-100 chars). Give this or cve. |
Output
Schema · Response
{
"type": "json",
"example": {
"query": {
"cve": "CVE-2024-3094"
},
"matched": 1,
"results": [
{
"id": "CVE-2024-3094",
"kev": {
"available": true,
"inCatalog": false,
"catalogVersion": "2026.09.25"
},
"cvss": {
"v2": null,
"v31": {
"type": "Primary",
"score": 10,
"source": "nvd@nist.gov",
"vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"severity": "CRITICAL"
},
"v40": null
},
"cwes": [
"CWE-506"
],
"epss": {
"date": "2026-09-25",
"available": true,
"percentile": 0.99723,
"probability": 0.85974
},
"nvdUrl": "https://nvd.nist.gov/vuln/detail/CVE-2024-3094",
"status": "Modified",
"affected": {
"total": 1,
"complete": true,
"products": [
{
"cpe": "cpe:2.3:a:tukaani:xz:5.6.0:*:*:*:*:*:*:*",
"vendor": "tukaani",
"product": "xz",
"version": "5.6.0"
}
],
"returned": 1
},
"severity": "CRITICAL",
"published": "2024-03-29T17:15:21.150",
"references": {
"links": [
{
"url": "https://access.redhat.com/security/cve/CVE-2024-3094",
"tags": [
"Vendor Advisory"
]
}
],
"total": 1,
"returned": 1
},
"description": "Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0...",
"lastModified": "2025-11-04T22:16:02.230"
}
],
"sources": {
"kev": {
"name": "CISA Known Exploited Vulnerabilities catalog (CC0)"
},
"nvd": {
"name": "NVD (NIST National Vulnerability Database)",
"notice": "This product uses the NVD API but is not endorsed or certified by the NVD."
},
"epss": {
"name": "EPSS, Exploit Prediction Scoring System (FIRST.org; scores by Empirical Security)"
}
},
"complete": true,
"returned": 1,
"fetchedAt": "2026-09-25T16:40:00.000Z",
"truncated": false
}
}Tags
x402
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