Zimbra End of Life (EOL) Dates & Support Timeline
Complete end-of-life dates, support windows, and security status for all Zimbra versions. Data sourced from endoflife.date and official vendor documentation. Updated at every deploy.
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Zimbra lifecycle status — the real story
Dates come from Zimbra's own release index (wiki.zimbra.com/wiki/Zimbra_Releases), which publishes one end date per line: End of General Support for 10.0 (2025-06-30), End of Technical Guidance for 9.0 (2025-06-30) and 8.8.15 LTS (2024-12-31); 10.1 has no end date published. Zimbra kept shipping 10.0.x patches for four months past 10.0's date (last: 10.0.18, 2025-11-06) and then stopped without announcement — every 2026 security fix, including the actively exploited CVE-2026-73570 (CISA KEV 2026-08-21), was released for 10.1.x only.
Zimbra release and support pattern
Across the 4 release lines with a published release date, Zimbra has shipped a new line roughly every 1.4 years (median interval). A line typically stays supported for about 5.2 years from its release to its end-of-life date (measured on the 3 lines with both dates published). 1 of the 4 tracked lines is designated long-term support, which is where the longer windows sit.
Of the 4 release lines tracked, 3 are past end of life and 1 is still within support. The newest line, 10.1, was released July 16, 2024. No end-of-life date is currently published for the 1 supported line.
Computed from the tracked release data at every build — the figures above are the dates in the table, restated, not an editorial estimate.
Zimbra security intelligence
CISA KEV history: Zimbra is named in CISA's Known Exploited Vulnerabilities catalog 19 times, most recently on 2026-08-21, including use in ransomware campaigns. Derived from CISA's live catalog at every build.
What does Zimbra end of life mean for your organization?
When a version of Zimbra reaches end of life, the maintainers stop issuing security patches. Vulnerabilities discovered after this date are publicly disclosed on the National Vulnerability Database, exploit code appears on GitHub, and your systems remain permanently exposed.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the accumulation of unpatched vulnerabilities in EOL software. With a zero-day, nobody knows about the vulnerability. With EOL software, the vulnerability is public — listed, rated, and often weaponized — but no patch will ever exist. This is the most dangerous gap in enterprise security posture.
Organizations running EOL Zimbra should treat it as a vulnerability class in their risk register, apply compensating controls (network segmentation, enhanced monitoring, access restriction), and prioritize migration to a supported version.
Your options when Zimbra reaches end of life
There are four realistic paths. Which one is right depends far more on how long the system needs to keep running than on the version you are on today.
| Option | Best when | Watch out for |
|---|---|---|
| Move to a supported version | The system will outlive the current version's support window and you can schedule the work | Budget for compatibility testing, not just the upgrade itself — that is where the real cost sits |
| Replace the component | The project is unmaintained, or a better-supported alternative exists | The replacement has its own lifecycle and its own end-of-life date — you are changing vendors, not escaping the problem |
| Buy extended support | Migration is genuinely underway but cannot finish before the deadline, or the workload is frozen by certification or a third-party application | A bridge, not a destination — every year purchased is a year the migration still has to happen |
| Document accepted risk | The system is isolated, short-lived, or scheduled for retirement | Only defensible with real compensating controls and a written decision — auditors treat undocumented end-of-life software as a finding |
How to choose, in one question: how many more years does this system need to run? Under a year, extended support (where it exists) is usually cheaper than an emergency migration. One to three years, migrate — support purchased repeatedly costs more than doing the project once, and the project only gets harder as the version ages. Indefinitely, migrate now and plan the next migration before it surprises you.
Worth saying plainly, because vendors selling extended support rarely will: extended support is often the more expensive choice over a multi-year horizon. It is the right answer when a deadline is genuinely unreachable, not as a default. Compare the annual fee against the one-time cost of migrating before committing to either.
Formalizing decisions like this across your estate? Our free EOL policy template is a ready-to-adopt policy with risk tiers, remediation SLAs, and audit mapping — no signup, free to use and share.
Extended Support Options
If you cannot migrate immediately, extended support vendors provide continued security patches for EOL Zimbra versions. This is a bridge, not a permanent solution — plan your migration in parallel.
Zimbra has 3 versions past end of life — security patches have stopped, but CVE disclosures haven't. Extended support past the official date exists for many products in this position — whether it exists for Zimbra is exactly what we check. Tell us where to reach you and we'll reply with matched options and pricing guidance — or an honest "no vendor covers this."