Cloudflare incident disrupting Klaviyo

Incident Report for Klaviyo

Resolved

Between 3:48am (US Eastern) and 4:10am (US Eastern) Cloudflare experienced an outage which affected Klaviyo. During this time, users were unable to access Klaviyo.com and all Klaviyo APIs. During this window, a number of services were affected. Subscription events and click tracking events were lost. Outbound campaign message sending was not affected.

Klaviyo is now fully operational and this incident has been resolved. https://www.cloudflarestatus.com/incidents/k9ppxftx8bs5

Posted Dec 05, 2025 - 04:00 EST