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CIRCL CVE Search vs Zenodo

Same instrument, two spec sheets — measured, not claimed.

APICIRCL CVE SearchHEALTHY90ZenodoHEALTHY57
Uptime · 30d
Uptime · 90d96.1%94.4%
Uptime · 30d94.8%96.7%
P50 · ms5031794
P95 · ms28994935
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitRetry-After: 5s30 req/window · 29 remaining · resets 1783516620
In directory since2026-07-052026-07-05
operationalpartialdownno data

CIRCL CVE Search vs Zenodo: common questions

Which is more reliable, CIRCL CVE Search or Zenodo?

On our scheduled checks, CIRCL CVE Search leads on measured uptime — CIRCL CVE Search at 96.1% versus Zenodo at 94.4% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, CIRCL CVE Search or Zenodo?

CIRCL CVE Search has the lower median latency in our checks — CIRCL CVE Search responds in 503 ms versus Zenodo at 1794 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do CIRCL CVE Search and Zenodo need an API key?

Zenodo needs no key, while CIRCL CVE Search requires a free API key. If you want to start calling without signup, reach for Zenodo first.

Can I call CIRCL CVE Search and Zenodo from the browser?

Only Zenodo is browser-friendly — it returns CORS headers over HTTPS. CIRCL CVE Search needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are CIRCL CVE Search and Zenodo free for commercial use?

CIRCL CVE Search has unclear commercial terms, and Zenodo has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.