AsyncOS 15.0 General Deployment

Published August 10, 2023


Cisco will be upgrading Cloud Gateway customer instances to the latest AsyncOS Maintenance Releases, ESA 15.0.0-104 and SMA 15.0.0-334.

The release notes for the ESA are located here.

The release notes for the SMA are located here.

Premium Software Support Customers

Your Cisco DSM (Designated Service Manager) will engage with you directly to evaluate and coordinate these upgrades.

Expected Impact

There should not be any email delivery disruption, however administrative access to your devices during this time period may be affected. Customers are requested to validate the health of systems post their upgrade window and report to Cisco TAC if any anomalies are observed.


Starting August 21, 2023


Maintenance Windows

Maintenance Windows: Sunday-Friday
Europe Window: 6 PM to 2 AM (BST, London)
Canada Window: 6 PM to 2 AM (PDT, Kamloops)
Americas Window: 6 PM to 2 AM (PDT, San Francisco)
APJ (Asia Pacific and Japan) Window: 6 PM to 2 AM (JST, Tokyo)

If you have any urgent questions about this maintenance or the possible impact, please contact Cisco TAC:

What's new with 15.0?

Please see our AsyncOS 15.0 Release Info.

Additional Information

Cisco Secure Email Gateway Documentation

Secure Email Cloud Gateway Documentation

Cisco Secure Email and Web Manager Documentation

Cisco Secure Product (Rebranding) Documentation