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Microsoft Security Response Center (MSRC) vs VulDB

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

APIMicrosoft Security Response Center (MSRC)HEALTHY92VulDBHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms538360
P95 · ms11071138
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — no key requiredFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Microsoft Security Response Center (MSRC) vs VulDB: common questions

Which is more reliable, Microsoft Security Response Center (MSRC) or VulDB?

Both are neck-and-neck — Microsoft Security Response Center (MSRC) and VulDB each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Microsoft Security Response Center (MSRC) or VulDB?

VulDB has the lower median latency in our checks — Microsoft Security Response Center (MSRC) responds in 538 ms versus VulDB at 360 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 Microsoft Security Response Center (MSRC) and VulDB need an API key?

Microsoft Security Response Center (MSRC) needs no key, while VulDB requires a free API key. If you want to start calling without signup, reach for Microsoft Security Response Center (MSRC) first.

Can I call Microsoft Security Response Center (MSRC) and VulDB from the browser?

Only VulDB is browser-friendly — it returns CORS headers over HTTPS. Microsoft Security Response Center (MSRC) needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Microsoft Security Response Center (MSRC) and VulDB free for commercial use?

Microsoft Security Response Center (MSRC) has unclear commercial terms, and VulDB 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.