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EPSS Exploit Score Lookup
x402
EPSS Exploit Score Lookup is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).
Returns the FIRST EPSS probability score, percentile, and scoring date for a given CVE, estimating the likelihood of exploitation in the next 30 days.
Price / call$0.002
Success—
StatusUnknown
How this service works
EPSS (Exploit Prediction Scoring System) for one CVE from FIRST's public API: the estimated probability (0 to 1) of exploitation in the next 30 days, its percentile among all scored CVEs and the scoring date. EPSS predicts; it does not say an exploit exists (see cisa-known-exploits).
Output
Returns a JSON object containing the CVE ID, EPSS probability score (0 to 1 representing likelihood of exploitation in the next 30 days), the CVE's percentile rank among all EPSS-scored CVEs, the date the score was calculated, a boolean indicating whether the CVE was scored, a link to the source FIRST API response, and the timestamp when the check was performed.
Example use cases
Triage high-priority CVE patches
“We just got an alert about CVE-2023-44487 — can you pull the EPSS score to tell me how likely it is to be exploited in the next 30 days and what percentile it falls in among all scored CVEs?”
Automate vulnerability risk enrichment
“For CVE-2024-3094, what does FIRST's EPSS model say about its exploitation probability? I need the score, percentile, and when it was last scored so I can prioritize our remediation queue.”
Evaluate Log4Shell ongoing risk
“Check the current EPSS exploitation prediction score for CVE-2021-44228 — is it still scoring near the top percentile compared to all other CVEs?”
Technical details
Endpoint
GEThttps://api.webintel-api.workers.dev/api/security/epss-exploit-score?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a probabilistic, forward-looking exploitation likelihood score from FIRST's EPSS model for a specific CVE. Prefer this over CISA Known Exploits when you want a predicted risk score rather than confirmation of active exploitation. Ideal for prioritizing patch queues and enriching vulnerability reports with exploitation probability data.
Side effects
- CVE ID not found in EPSS database — returns scored: false
- Malformed CVE ID format causes query failure
- FIRST upstream API unavailable or rate-limited
- CVE is too new to have an EPSS score yet
- Network timeout to upstream FIRST API
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"date": "2026-10-22",
"epss": 0.99999,
"cveId": "CVE-2021-44228",
"scored": true,
"source": "https://api.first.org/data/v1/epss?cve=CVE-2021-44228",
"checkedAt": "2026-10-23T09:38:39.115Z",
"percentile": 1
}
}Tags
x402
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