Apache Solr 4 · Version Status

Apache Solr 4 End of Life Date

Apache Solr 4 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.

✓ Apache Solr 4 is actively supported. EOL date: No EOL date.
EOL Date
No EOL date
Supported
Latest Release
4.10.4
Standard release
Release Date
Oct 11, 2012
Apache Solr 4 series
← Apache Solr 3 All Apache Solr versions Apache Solr 5 →
10 / 100
Low Risk
EOL Risk Score™  How is this calculated? →
EOL Recency
0/40
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 Apache Solr Versions
VersionLatestEOL DateStatus
1 1.4.1 Supported Active
3 3.6.2 Supported Active
→ 4 4.10.4 Supported Active
5 5.5.5 Oct 24, 2017 EOL
6 6.6.6 Mar 13, 2019 EOL
7 7.7.3 May 11, 2022 EOL
8 8.11.4 Oct 25, 2024 EOL
9 9.10.1 EOL Active

What does Apache Solr 4 end of life mean?

When Apache Solr 4 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 Apache Solr 4 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.

Migrate to Apache Solr 10 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.

Frequently Asked Questions
When does Apache Solr 4 reach end of life?
Apache Solr 4 has no scheduled end-of-life date and is supported indefinitely.
Is Apache Solr 4 still supported?
Yes, Apache Solr 4 is currently supported. The EOL date is No EOL date.
What should I upgrade to from Apache Solr 4?
The recommended upgrade from Apache Solr 4 is Apache Solr 10 — the latest actively supported version. Check the Apache Solr full timeline for all supported versions.
What are the security risks of running Apache Solr 4 past EOL?
When Apache Solr 4 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 Apache Solr should migrate immediately or implement compensating controls.
Data from endoflife.date API · Generated at build time · How we source data →