# Klaviyo: Cloudflare incident disrupting Klaviyo

- Impact (vendor’s label): none
- Status: resolved
- Started: 2025-12-05 10:42 UTC · Resolved: 2025-12-05 09:00 UTC · Duration: -102 min
- Updates: 1
- [Vendor status page: https://stspg.io/bbj7gt47htp5](https://stspg.io/bbj7gt47htp5)
- [Company: Klaviyo](https://rewindex.com/company/klaviyo.md)

## Part of an outage event

- [Cloudflare outage, Dec 5, 2025: 46 vendors, 46 incidents](https://rewindex.com/events/2025-12-05-cloudflare)
- This incident blames Cloudflare as the cause. (hop 1, posted +1 h 55 min vs the first vendor naming Cloudflare)
- Evidence: “…Cloudflare incident disrupting Klaviyo 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 Klaviy…”

```mermaid
flowchart LR
  root["Cloudflare<br/>own incident not archived"]:::inferred
  h1["Within an hour<br/>18 vendors, 18 blamed Cloudflare<br/>Unbounce, Expo, GitLab +15"]:::blames
  root --> h1
  h4["1 to 4 hours later<br/>1 vendor, 1 blamed Cloudflare<br/>Klaviyo"]:::blames
  root --> h4
  later["Later<br/>2 vendors, 2 blamed Cloudflare<br/>Bitrise, Sigma Computing"]:::blames
  root --> later
  me["Klaviyo (this incident)<br/>posted +1 h 55 min"]:::me
  h4 --- me
```

_Detected automatically from incidents that started together and named the same provider; a link means one incident named another vendor, not a confirmed cause._

## Timeline of updates

- **resolved** 2025-12-05 09:00 UTC: 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


---
Canonical: https://rewindex.com/company/klaviyo/incidents/ncpm2nh38xz4 · Markdown: https://rewindex.com/company/klaviyo/incidents/ncpm2nh38xz4.md · JSON: https://rewindex.com/api/v1/companies/klaviyo/incidents/ncpm2nh38xz4 · Generated 2026-10-20T00:06:46.834Z