shipapis
StarSubmit an APISubmit API

Microsoft Security Response Center (MSRC) vs National Vulnerability Database

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

APIMicrosoft Security Response Center (MSRC)NEW—National Vulnerability DatabaseNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic domain (U.S. Government work)
Free tierFree — no key requiredFree — no key required (free key raises limits)
Rate limitUnpublished5 requests per rolling 30 seconds without an API key (50 with a free key)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Microsoft Security Response Center (MSRC) vs National Vulnerability Database: common questions

Which is more reliable, Microsoft Security Response Center (MSRC) or National Vulnerability Database?

On our scheduled checks, National Vulnerability Database leads on measured uptime — Microsoft Security Response Center (MSRC) at —% versus National Vulnerability Database at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Microsoft Security Response Center (MSRC) and National Vulnerability Database need an API key?

Neither needs a paid key — Microsoft Security Response Center (MSRC) is callable with no signup, and National Vulnerability Database is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Microsoft Security Response Center (MSRC) and National Vulnerability Database from the browser?

Only National Vulnerability Database 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 National Vulnerability Database free for commercial use?

Microsoft Security Response Center (MSRC) has unclear commercial terms, and National Vulnerability Database allows commercial use on its free tier. 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.