# CVE Lookup / NVD Vulnerability Database

> CVE Lookup / NVD Vulnerability Database is a paid API for AI agents from x402-deployer.x402-deployer.workers.dev, paid per call via x402, $0.005000/call, status unknown (last checked 2026-09-15).

Looks up CVE records from the NIST NVD, returning CVSS v3.1 and v2 scores, severity, affected CPEs, CWE class, references, exploit indicators, and an LLM-generated exploitability summary.

## Facts

- Endpoint: POST https://x402-deployer.x402-deployer.workers.dev/cve-lookup
- Price: $0.005000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-deployer-x402-deployer-workers-dev-2a9fe771
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tLSSWHNEi4z3xicauPC5a

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 x402-deployer-x402-deployer-workers-dev-2a9fe771 -d '<json body>'
```

Example prompt: Can you look up CVE-2021-44228 (Log4Shell) and tell me its CVSS v3.1 score, severity, which products are affected, whether there's a known public exploit, and give me an AI summary of how exploitable it is?

## When to prefer this

Use this endpoint when you need structured, authoritative vulnerability data including CVSS scores, CPE impact scope, CWE class, and exploit availability — especially when you also want an LLM-generated exploitability summary in a single call. Prefer over raw NVD API calls when you need enriched, agent-ready output with payment handled via x402.

## Known failure modes

- CVE ID not found in NVD — returns error or empty result
- Malformed CVE ID format — returns validation error
- NVD upstream unavailable — service error or timeout
- CVE too recent to be indexed — partial or missing data
- Payment failure — request rejected before processing

## How this service works

CVE lookup / vulnerability database. NIST NVD-backed. CVSS v3.1 + v2 scores, severity, affected CPEs, CWE class, references, public-exploit indicators. Plus LLM exploitability summary.

## Output

Returns the full NVD record for the requested CVE including CVSS v3.1 and v2 base scores, severity label (Critical/High/Medium/Low), list of affected CPEs, CWE classification, reference URLs, a boolean/indicator for whether a public exploit is known, and an LLM-generated plain-English summary of the vulnerability's exploitability.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "cve_id"
     ],
     "properties": {
      "cve_id": {
       "type": "string",
       "description": "CVE identifier in 'CVE-YYYY-NNNN[N...]' format. Case-insensitive. Example 'CVE-2021-44228' (Log4Shell)."
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "cwe": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "score": {
       "type": "integer"
      },
      "cve_id": {
       "type": "string"
      },
      "status": {
       "type": "string"
      },
      "cvss_v2": {
       "type": "object",
       "properties": {
        "severity": {
         "type": "string"
        },
        "base_score": {
         "type": "number"
        }
       }
      },
      "severity": {
       "type": "string"
      },
      "cvss_v3_1": {
       "type": "object",
       "properties": {
        "base_score": {
         "type": "integer"
        },
        "base_severity": {
         "type": "string"
        },
        "vector_string": {
         "type": "string"
        }
       }
      },
      "published": {
       "type": "string"
      },
      "references": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "url": {
          "type": "string"
         },
         "tags": {
          "type": "array",
          "items": {
           "type": "string"
          }
         },
         "source": {
          "type": "string"
         }
        }
       }
      },
      "description": {
       "type": "string"
      },
      "affected_cpes": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "last_modified": {
       "type": "string"
      },
      "exploit_summary": {
       "t
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-deployer-x402-deployer-workers-dev-2a9fe771/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-deployer.x402-deployer.workers.dev](https://www.zero.xyz/host/x402-deployer.x402-deployer.workers.dev/llms.txt)