Symfony 4.3 · Version Status
Symfony 4.3 End of Life Date
Symfony 4.3 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Symfony 4.3 is past end of life. This version no longer receives security patches. 2138 days past EOL — migrate to a supported version immediately.
EOL Date
Jul 1, 2020
2138 days past EOL
Latest Release
4.3.11
Standard release
Release Date
May 30, 2019
Symfony 4.3 series
| Version | Latest | EOL Date | Status |
|---|
| 2.3 LTS |
2.3.42 |
May 1, 2017 |
EOL |
| 2.7 LTS |
2.7.52 |
May 1, 2019 |
EOL |
| 2.8 LTS |
2.8.52 |
Nov 1, 2019 |
EOL |
| 3.0 |
3.0.9 |
Jan 1, 2017 |
EOL |
| 3.1 |
3.1.10 |
Jul 1, 2017 |
EOL |
| 3.2 |
3.2.14 |
Jan 1, 2018 |
EOL |
| 3.3 |
3.3.18 |
Jul 1, 2018 |
EOL |
| 3.4 LTS |
3.4.49 |
Nov 1, 2021 |
EOL |
What does Symfony 4.3 end of life mean?
When Symfony 4.3 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 Symfony 4.3 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Symfony 7.4 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Symfony 4.3 reach end of life?
Symfony 4.3 reached end of life on July 1, 2020. This version is no longer receiving security patches.
Is Symfony 4.3 still supported?
No. Symfony 4.3 reached end of life on July 1, 2020 and is no longer receiving security patches.
What should I upgrade to from Symfony 4.3?
The recommended upgrade from Symfony 4.3 is
Symfony 7.4 — the latest actively supported version. Check the
Symfony full timeline for all supported versions.
What are the security risks of running Symfony 4.3 past EOL?
When Symfony 4.3 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 Symfony should migrate immediately or implement compensating controls.