AsyncOS 14.3 Refresh

Published January 13, 2023


Cisco will be upgrading Cloud Gateway customer instances to the latest AsyncOS Maintenance Releases, ESA 14.3.0-032 and SMA 14.3.0-120. Both this ESA release and SMA release are cloud-only.

The release notes for the ESA are located here.

The release notes for the SMA are located here.


What is Cloud-only? This release of AsyncOS is pushed for all Cisco Secure Email Cloud Gateway customers (formerly Cisco Cloud Email Security [CES]).

Mandatory Upgrade

The unupgradable tags will not be considered for this upgrade. This new release contains critical security fixes aimed to improve the product resilience against attacks by authenticated threat actors.

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 the week of January 23, 2023


Customer Action

Coordinate an upgrade with TAC Support or your DSM(s) before February 10, 2023, or you’ll be subject to an automatic upgrade in the regional maintenance window.


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 14.3?

Please see our AsyncOS 14.3 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