Eclipse Temurin 21 · Version Status
Eclipse Temurin 21 End of Life Date
Eclipse Temurin 21 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Eclipse Temurin 21 is actively supported. EOL date: December 31, 2029.
📅 Get reminded before Eclipse Temurin 21 reaches EOL on December 31, 2029 — alerts 90, 30 & 7 days out.
EOL Date
Dec 31, 2029
1240 days remaining
Latest Release
21.0.12+8
LTS release
Release Date
Oct 10, 2023
Eclipse Temurin 21 series
Lifecycle detail
Eclipse Temurin 21 was released on October 10, 2023 and support is scheduled to end on December 31, 2029 — a planned supported lifespan of 6 years and 3 months, in line with the 6 years and 3 months median for Eclipse Temurin LTS releases. It is a long-term support (LTS) release, so it carries a longer patch window than the interim releases around it. Its most recent patch is 21.0.12+8, published July 24, 2026.
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 →
All Eclipse Temurin Versions
| Version | Latest | EOL Date | Status |
|---|
| 8 LTS |
8u502-b07 |
Dec 31, 2030 |
Active |
| 16 |
16.0.2+7 |
Sep 30, 2021 |
EOL |
| 11 LTS |
11.0.32+9 |
Oct 31, 2027 |
Active |
| 17 LTS |
17.0.20+8 |
Oct 31, 2027 |
Active |
| 18 |
18.0.2.1+1 |
Sep 30, 2022 |
EOL |
| 19 |
19.0.2+7 |
Mar 31, 2023 |
EOL |
| 20 |
20.0.2+9 |
Sep 19, 2023 |
EOL |
| → 21 LTS |
21.0.12+8 |
Dec 31, 2029 |
Active |
What does Eclipse Temurin 21 end of life mean?
When Eclipse Temurin 21 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 Eclipse Temurin 21 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Eclipse Temurin 25 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Eclipse Temurin 21 reach end of life?
Eclipse Temurin 21 reached end of life on December 31, 2029. That is 1240 days remaining.
Is Eclipse Temurin 21 still supported?
Yes, Eclipse Temurin 21 is currently supported. The EOL date is December 31, 2029.
What should I upgrade to from Eclipse Temurin 21?
The recommended upgrade from Eclipse Temurin 21 is
Eclipse Temurin 25 — the latest actively supported version. Check the
Eclipse Temurin full timeline for all supported versions.
What are the security risks of running Eclipse Temurin 21 past EOL?
When Eclipse Temurin 21 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 Eclipse Temurin should migrate immediately or implement compensating controls.