Question 1

What is the EOL Risk Score for Cisco Secure Email Gateway 16.5?

Accepted Answer

Cisco Secure Email Gateway 16.5 has an EOL Risk Score™ of 30 out of 100, placing it in the Medium risk band. The score is calculated from four factors: EOL Recency (0/40), Attack Surface (10/30), CISA KEV Exposure (20/20), and Extended Support Availability (0/10).

Question 2

Is Cisco Secure Email Gateway 16.5 still supported?

Accepted Answer

Cisco Secure Email Gateway 16.5 is currently supported. End of life is scheduled for August 30, 2029. Plan your migration before that date to avoid security risk.

Question 3

When does Cisco Secure Email Gateway 16.5 reach end of life?

Accepted Answer

Cisco Secure Email Gateway 16.5 reached (or will reach) end of life on August 30, 2029. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Cisco Secure Email Gateway 16.5 after end of life?

Accepted Answer

After end of life, Cisco Secure Email Gateway 16.5 no longer receives security patches. Any newly discovered CVEs remain unpatched indefinitely. Organizations running EOL software also face compliance violations under SOC 2, PCI DSS, HIPAA, and ISO 27001, which require use of supported software versions.