NVD · Rate Limits

Nvd Rate Limits

NVD enforces rolling 30-second windows. Without an API key, clients are limited to 5 requests per 30 seconds; with a free API key, 50 requests per 30 seconds. NVD recommends sleeping 6 seconds between requests to stay below the threshold. Limits are per public IP (anonymous) or per API key. Exceeding the threshold returns 403 with a temporary block.

Nvd Rate Limits is the machine-readable rate-limit profile for NVD on the APIs.io network, in the API Commons Rate Limits shape.

It captures 2 rate-limit definitions, measuring requests_per_30s.

An exhausted limit returns HTTP 403.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

The profile also includes 4 backoff/retry policies defined and response codes documented for throttled and serviceUnavailable.

Tagged areas include Security, CVE, CPE, Vulnerability, and CVSS.

2 Limits Exhausted: HTTP 403
Method: generated, dated 2026-05-05.
Written by API Evangelist on 2026-05-05 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
View Source
SecurityCVECPEVulnerabilityCVSSRate Limiting

Limits

Anonymous (no API key) IP
requests_per_30s · 30 seconds
5
Rolling 30-second window across all NVD endpoints.
With API Key api-key
requests_per_30s · 30 seconds
50
Rolling 30-second window. Pass the key via the apiKey query parameter or X-API-KEY header.

Policies

Recommended sleep interval
NVD recommends sleeping at least 6 seconds between requests to stay safely under the rolling 30-second window.
Backoff
On throttling (403), pause and resume after the rolling window resets. Implement exponential backoff for repeated throttle responses.
Pagination
Use the resultsPerPage and startIndex parameters (max 2000 for CVEs, 10000 for CPEs) to retrieve large result sets within the rate limit.
Terms of use
Use of NVD data is subject to the NVD Terms of Use; commercial use is permitted with attribution.

Sources

Work with this as data

Every rate limit here is available over the APIs.io API and to AI agents over MCP.

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Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This rate limit 
curl "https://apis.io/api/v1/rate-limits/nvd-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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