# SiteCheck Web Intel CVE NVD Lookup

> SiteCheck Web Intel CVE NVD 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 2026-10-25).

Fetches a single CVE record from the NIST National Vulnerability Database, including description, CVSS score/severity, CWE IDs, and reference URLs

## Facts

- Endpoint: GET https://api.webintel-api.workers.dev/api/security/cve-nvd-lookup?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-web-intel-cve-nvd-lookup-bc0eaf17
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2oaqFMRCt8dKXSzWTpVK2

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sitecheck-web-intel-cve-nvd-lookup-bc0eaf17
```

Example prompt: Can you pull up the NVD details for CVE-2021-44228 — I need the CVSS severity score, the CWE IDs, and a short description of the vulnerability.

## When to prefer this

Use this endpoint when you need structured NVD data for a specific CVE — description, CVSS score, severity, CWE IDs, and reference links — without needing exploitation status. For exploitation likelihood, pair with EPSS or CISA Known Exploits endpoints. Prefer this over scraping NVD directly since it's a pay-per-call API that handles NVD querying and normalization for you.

## Known failure modes

- CVE ID not found in NVD — returns error or empty result
- Malformed CVE ID format (e.g. missing 'CVE-' prefix) — returns validation error
- NVD upstream API unavailable — may return timeout or 503
- CVE exists but has no CVSS score yet (newly published) — score fields may be null
- Rate limiting or payment failure via x402 protocol

## How this service works

One CVE record from the NIST National Vulnerability Database: description, published and last-modified dates, NVD status, primary CVSS score and severity (v4.0, 3.1, 3.0 or 2.0, whichever NVD marks primary first), CWE weakness IDs and up to 5 reference URLs. It does not say whether the CVE is being exploited (use cisa-known-exploits or epss-exploit-score for that).

## Output

Returns a structured record for the requested CVE including: plain-language description, published and last-modified timestamps, NVD processing status, primary CVSS score and severity (from v4.0, 3.1, 3.0, or 2.0 — whichever NVD marks primary), associated CWE weakness IDs, and up to 5 reference URLs. Does not include exploitation status or EPSS scores.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "cveId"
     ],
     "properties": {
      "cveId": {
       "type": "string",
       "description": "CVE identifier such as CVE-2021-44228 (required)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-web-intel-cve-nvd-lookup-bc0eaf17/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.webintel-api.workers.dev](https://www.zero.xyz/host/api.webintel-api.workers.dev/llms.txt)