Synology DSM End of Life (EOL) Dates & Support Timeline
Complete end-of-life dates, support windows, and security status for all Synology DSM versions. Data sourced from endoflife.date and official vendor documentation. Updated at every deploy.
Synology DSM 7.2 is supported, with no end-of-life or end-of-support date announced yet. 10 of 13 tracked Synology DSM versions are past end of life; the most recent to reach it, 6.2, did so on October 1, 2024. The full Synology DSM lifecycle, with every version's release and end-of-support date, is in the table below.
Running an EOL version? Get matched with support options — free ↓| Version | Latest Release | Release Date | EOL Date | Days | Status |
|---|---|---|---|---|---|
| 4.2 LTS | — | — | Not published | Past EOL | EOL |
| 4.3 | — | — | Not published | Past EOL | EOL |
| 5.0 | — | — | Not published | Past EOL | EOL |
| 5.1 | — | — | Not published | Past EOL | EOL |
| 5.2 LTS | — | — | Not published | Past EOL | EOL |
| 6.0 | — | — | Not published | Past EOL | EOL |
| 6.1 | — | — | Not published | Past EOL | EOL |
| 6.2 LTS | — | — | Oct 1, 2024 | 740 days past EOL | EOL |
| 7.0 | — | — | Not published | Past EOL | EOL |
| 7.1 LTS | — | — | Not published | Past EOL | EOL |
| 7.2 | — | — | TBD | Supported | Active |
| 7.3 LTS | — | — | TBD | Supported | Active |
| 7.4 | — | — | TBD | Supported | Active |
Live EOL badge for your README — updates automatically at every build.
[](https://endoflife.ai/synology-dsm)
Synology DSM lifecycle status — the real story
Synology DiskStation Manager (DSM), the operating system of Synology NAS appliances. Cycles are DSM minor versions, as Synology defines them ('Each minor version of DSM, such as DSM 6.2, is identified as a different product'). Synology's Software Life Cycle Policy (white paper, last updated September 15, 2026) prints General Availability, End of Maintenance Phase and End of Extended Life Phase as months only and says 'All future dates mentioned for life-cycle phases are close approximations, non-definitive, and subject to be extended.' So: support = end of the Maintenance Phase and eol = end of the Extended Life Phase (or of the Maintenance Phase where Synology prints N/A), served as true when the month has passed and false when it has not; no day is invented. The one exact day is DSM 6.2: Synology's End-of-Life Announcement says 'DSM 6.2 will reach the end of the Extended Life Phase on October 1, 2024' (the white paper prints Sep 2024).
Phases in Synology's words: 'During the Maintenance Phase, only qualified Synology-defined Critical impact security fixes, selected urgent priority bug fixes may be released'; 'During the Extended Life Phase, only qualified Synology-defined Critical impact security fixes may be released as they become available.' The Extended Life Phase is offered only for versions marked LTS (7.3, 7.1, 6.2, 5.2, 4.2), and for DSM 7.1 only on the 13 to 15 series models Synology lists.
As read on 2026-10-10: DSM 7.4 (GA June 2026, maintenance to June 2028) and DSM 7.3 LTS (GA October 2025, maintenance to October 2027, extended life to October 2028) are current; DSM 7.2 is served as not ended: the white paper prints its End of Maintenance as December 2025 with no extended phase, but Synology's DSM release notes list 7.2.2-72806 Update 9 and 7.2.1-69057 Update 12 on June 30, 2026, both with 'Fixed security vulnerabilities (Synology-SA-26:06)', so the vendor is still shipping 7.2 security updates; DSM 7.1 ended June 2025 (extended life, listed models only). DSM Enterprise, DSM UC, SRM, BeeStation OS and ActiveProtect Manager are separate rows or sections and are not modelled. latest is null: the white paper names no builds. KEV: Synology has no CISA KEV entry (catalog 2026.10.08).
Synology DSM release and support pattern
5 of the 13 tracked lines are designated long-term support, which is where the longer windows sit.
Of the 13 release lines tracked, 10 are past end of life and 3 are still within support; 9 are marked end of life without a published date. No end-of-life date is currently published for the 3 supported lines.
Computed from the tracked release data at every build — the figures above are the dates in the table, restated, not an editorial estimate.
What does Synology DSM end of life mean for your organization?
When a version of Synology DSM 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: A CVE-based scan does not show the accumulation of unpatched vulnerabilities in EOL software. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. With a zero-day, nobody knows about the vulnerability. With EOL software, the vulnerability is public — listed, rated, and often weaponized — but no vendor patch is coming. This is one of the most dangerous gaps in enterprise security posture.
Organizations running EOL Synology DSM 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 Synology DSM 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 Synology DSM versions. This is a bridge, not a permanent solution — plan your migration in parallel.
Synology DSM has 10 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 Synology DSM 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."