| AsyncOS | Release Type | Release Date |
| AsyncOS 16.0 for Cisco Secure Email Gateway | GD (General Deployment) | 2024-10-03 |
| AsyncOS 15.5.3 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2025-01-06 |
| AsyncOS 15.5.2 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2024-08-20 |
| AsyncOS 15.5.1 for Cisco Secure Email Gateway | GD (General Deployment) | 2024-04-30 |
| AsyncOS 15.0.3 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2024-10-29 |
| AsyncOS 15.0.2 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2024-06-06 |
| AsyncOS 15.0.1 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2023-11-22 |
| AsyncOS 15.0.0 for Cisco Secure Email Gateway | GD (General Deployment) | 2023-08-10 |
| AsyncOS 14.2.3 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2023-11-02 |
| AsyncOS 14.2.2 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2023-02-16 |
| AsyncOS 14.2.1 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2022-09-21 |
| AsyncOS 14.0.2 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2022-01-18 |
| AsyncOS 14.2.0 for Cisco Secure Email Gateway | GD (General Deployment) | 2022-05-27 |
| AsyncOS 14.0.1 for Cisco Secure Email Gateway | MD (Maintenance Deployment) | 2021-08-25 |
| AsyncOS 14.0.0 for Cisco Secure Email Gateway | GD (General Deployment) | 2021-06-14 |
| AsyncOS 13.5.4 for Cisco Email Security Appliances | MD (Maintenance Deployment) | 2021-11-03 |
| AsyncOS 13.5.3 for Cisco Email Security Appliances | MD (Maintenance Deployment) | 2021-01-20 |
| AsyncOS 13.5.2 for Cisco Email Security Appliances | MD (Maintenance Deployment) | 2020-09-25 |
| AsyncOS 13.5.1 for Cisco Email Security Appliances | GD (General Deployment) | 2020-06-12 |
| AsyncOS 13.0.5 for Cisco Email Security Appliances | MD (Maintenance Deployment) | 2022-06-30 |
| AsyncOS 13.0.2 for Cisco Email Security Appliances | MD (Maintenance Deployment) | 2020-10-23 |
| AsyncOS 13.0.1 for Cisco Email Security Appliances | MD (Maintenance Deployment) | 2020-05-28 |
| AsyncOS 13.0.0 for Cisco Email Security Appliances | GD (General Deployment) | 2020-02-03 |
Cisco ESA/SMA
