Zulip incident

DDoS attack on Zulip Cloud

Critical Resolved View vendor source →

Zulip experienced a critical incident on December 18, 2023 affecting Zulip Cloud and Mobile Push Notification Service, lasting 7h 4m. The incident has been resolved; the full update timeline is below.

Started
Dec 18, 2023, 09:38 PM UTC
Resolved
Dec 19, 2023, 04:42 AM UTC
Duration
7h 4m
Detected by Pingoru
Dec 18, 2023, 09:38 PM UTC

Affected components

Zulip CloudMobile Push Notification Service

Update timeline

  1. investigating Dec 18, 2023, 09:38 PM UTC

    We are experiencing a DDoS attack and are working on it.

  2. investigating Dec 18, 2023, 10:09 PM UTC

    We are continuing to investigate this issue.

  3. monitoring Dec 18, 2023, 11:10 PM UTC

    We have mitigated the attack, and are monitoring the situation.

  4. resolved Dec 19, 2023, 04:42 AM UTC

    This incident has been resolved.