Cisco Secure Email Gateway 16.0 · Version Status
Cisco Secure Email Gateway 16.0 End of Life Date
Cisco Secure Email Gateway 16.0 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
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Cisco Secure Email Gateway 16.0 is actively supported. EOL date: October 30, 2027.
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EOL Date
Oct 30, 2027
410 days remaining
Latest Release
16.0.4-302
Standard release
Release Date
Oct 3, 2024
Cisco Secure Email Gateway 16.0 series
Lifecycle detail
Cisco Secure Email Gateway 16.0 was released on October 3, 2024 and support is scheduled to end on October 30, 2027 — a planned supported lifespan of 3 years and 1 month, in line with the 3 years and 1 month median for Cisco Secure Email Gateway releases.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
20/20 Named in CISA KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
All Cisco Secure Email Gateway Versions
What does Cisco Secure Email Gateway 16.0 end of life mean?
When Cisco Secure Email Gateway 16.0 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running Cisco Secure Email Gateway 16.0 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Cisco Secure Email Gateway 16.5 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Cisco Secure Email Gateway 16.0 reach end of life?
Cisco Secure Email Gateway 16.0 reached end of life on October 30, 2027. That is 410 days remaining.
Is Cisco Secure Email Gateway 16.0 still supported?
Yes, Cisco Secure Email Gateway 16.0 is currently supported. The EOL date is October 30, 2027.
What should I upgrade to from Cisco Secure Email Gateway 16.0?
The recommended upgrade from Cisco Secure Email Gateway 16.0 is
Cisco Secure Email Gateway 16.5 — the latest actively supported version. Check the
Cisco Secure Email Gateway full timeline for all supported versions.
What are the security risks of running Cisco Secure Email Gateway 16.0 past EOL?
When Cisco Secure Email Gateway 16.0 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL Cisco Secure Email Gateway should migrate immediately or implement compensating controls.