Eclipse Temurin 21 End of Life Date
Eclipse Temurin 21 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.
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 21.0.12.1+1, published August 19, 2026.
| Version | Latest | EOL Date | Status |
|---|---|---|---|
| 8 LTS | 8u504-b01 | Dec 31, 2030 | Active |
| 16 | 16.0.2+7 | Sep 30, 2021 | EOL |
| 11 LTS | 11.0.32.1+1 | Oct 31, 2027 | Active |
| 17 LTS | 17.0.20.1+1 | 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 | 21.0.12.1+1 | 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.