Cisco Secure Email Threat Defense incident

Outage in US and Australia Region

Major Resolved View vendor source →

Cisco Secure Email Threat Defense experienced a major incident on October 20, 2025 affecting Management Portal and Cloud Service Provider and 1 more component, lasting 16h 17m. The incident has been resolved; the full update timeline is below.

Started
Oct 20, 2025, 07:00 AM UTC
Resolved
Oct 20, 2025, 11:18 PM UTC
Duration
16h 17m
Detected by Pingoru
Oct 20, 2025, 07:00 AM UTC

Affected components

Management PortalCloud Service ProviderMessage ProcessingMessage Processing

Update timeline

  1. investigating Oct 20, 2025, 10:04 AM UTC

    Cisco Secure Email Threat Defense services are impacted in the US region and degraded in the Australia region. Our teams are actively investigating the issue. This is related to an outage with our cloud provider in the region. We shall keep you informed of the progress every hour.

  2. identified Oct 20, 2025, 11:00 AM UTC

    We are currently working on a fix as the underlying cloud provider outage seem to be recovering, however some issues still remain. We shall keep you updated on the progress.

  3. identified Oct 20, 2025, 11:53 AM UTC

    This issue is still ongoing. There are still underlying issues with our cloud provider that is preventing full restoration of the service. Our engineers are actively engaged to resolve this as soon as possible.

  4. identified Oct 20, 2025, 11:58 AM UTC

    We are continuing to work on a fix for this issue.

  5. identified Oct 20, 2025, 01:42 PM UTC

    We are continuing to work on this issue.

  6. identified Oct 20, 2025, 04:13 PM UTC

    We are continuing to work on this issue.

  7. identified Oct 20, 2025, 07:34 PM UTC

    We are continuing to work on this issue.

  8. identified Oct 20, 2025, 08:34 PM UTC

    A public cloud offering technology issue is currently affecting some Email Threat Defense systems, resulting in intermittent impacts to our ability to process email content. Cisco is actively working with the vendor to resolve the issue, and we appreciate your patience during this time. We recommend that you advise your email users to exercise extra caution when opening emails and interacting with links or attachments while this outage is ongoing.

  9. identified Oct 20, 2025, 11:15 PM UTC

    Issue is fully resolved now

  10. resolved Oct 20, 2025, 11:18 PM UTC

    This incident has been resolved.