Checkmk 2.1 · Version Status
Checkmk 2.1 End of Life Date
Checkmk 2.1 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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Checkmk 2.1 is past end of life. This version no longer receives security patches. 675 days past EOL — migrate to a supported version immediately.
EOL Date
Nov 24, 2024
675 days past EOL
Latest Release
2.1
Standard release
Release Date
May 24, 2022
Checkmk 2.1 series
Lifecycle detail
Checkmk 2.1 was released on May 24, 2022 and support ended on November 24, 2024 — a supported lifespan of 2 years and 6 months, in line with the 2 years and 6 months median for Checkmk releases. The last patch it will ever receive is 2.1, published May 24, 2022 — 2 years and 6 months before support ended. It has been without security patches for 1 year and 10 months. 2 newer Checkmk releases have shipped since.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
0/20 Not in 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 →
Extended Support
Extended Checkmk 2.1 support is available
Commercial vendors offer security patches beyond EOL. Compare your options.
Compare Options →
| Version | Latest | EOL Date | Status |
|---|
| 2.0 |
2.0 |
Sep 9, 2023 |
EOL |
| → 2.1 |
2.1 |
Nov 24, 2024 |
EOL |
| 2.2 |
2.2 |
Nov 23, 2025 |
EOL |
| 2.3 |
2.3 |
Oct 29, 2026 |
Warning |
| 2.4 |
2.4 |
Nov 6, 2027 |
Active |
| 2.5 |
2.5 |
Apr 28, 2028 |
Active |
What does Checkmk 2.1 end of life mean?
When Checkmk 2.1 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: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running Checkmk 2.1 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to Checkmk 2.5 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Checkmk 2.1 reach end of life?
Checkmk 2.1 reached end of life on November 24, 2024. This version is no longer receiving security patches.
Is Checkmk 2.1 still supported?
No. Checkmk 2.1 reached end of life on November 24, 2024 and is no longer receiving security patches.
What should I upgrade to from Checkmk 2.1?
The recommended upgrade from Checkmk 2.1 is
Checkmk 2.5 — the latest actively supported version. Check the
Checkmk full timeline for all supported versions.
What are the security risks of running Checkmk 2.1 past EOL?
When Checkmk 2.1 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no vendor fix. A CVE-based scan does not show this — it is the CVE blind spot; some scanners flag unsupported versions of common products, but coverage varies and none give the date in advance. Organizations running EOL Checkmk should migrate immediately or implement compensating controls.