PHP 4.0 · Version Status
PHP 4.0 End of Life Date
PHP 4.0 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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PHP 4.0 is past end of life. This version no longer receives security patches. 9268 days past EOL — migrate to a supported version immediately.
EOL Date
Jun 23, 2001
9268 days past EOL
Latest Release
4.0.6
Standard release
Release Date
May 22, 2000
PHP 4.0 series
Where these dates come from
End of lifeJun 23, 2001Vendor's own page, read by our adapter · php.net · checked Nov 3, 2026high · 2 sources agree End of active supportJun 23, 2001endoflife.date (open dataset) · endoflife.datemedium · 1 source agrees ReleaseMay 22, 2000Vendor's own page, read by our adapter · php.net · checked Nov 3, 2026high · 2 sources agree Confidence: high = two or more independent sources agree (the vendor's page read by our adapter, a person's check against the vendor, the dataset the date came from); medium = one; low = the vendor page disagrees or our last read is stale.
How we source dates.
Lifecycle detail
PHP 4.0 was released on May 22, 2000 and support ended on June 23, 2001 — a supported lifespan of 1 year and 1 month, shorter than the 3 years and 1 month median for PHP releases. Its latest release on record is 4.0.6, published June 23, 2001 — on the day support ended. It has been past its end-of-life date for 25 years and 5 months. 22 newer PHP releases have shipped since.
Attack Surface
30/30 Critical tier
CISA KEV Exposure
20/20 Named in CISA 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 →
| Version | Latest | EOL Date | Status |
|---|
| → 4.0 |
4.0.6 |
Jun 23, 2001 |
EOL |
| 4.1 |
4.1.2 |
Mar 12, 2002 |
EOL |
| 4.2 |
4.2.3 |
Sep 6, 2002 |
EOL |
| 4.3 |
4.3.11 |
Mar 31, 2005 |
EOL |
| 5.0 |
5.0.5 |
Sep 5, 2005 |
EOL |
| 4.4 |
4.4.9 |
Aug 7, 2008 |
EOL |
| 5.1 |
5.1.6 |
Aug 24, 2006 |
EOL |
| 5.2 |
5.2.17 |
Jan 6, 2011 |
EOL |
What does PHP 4.0 end of life mean?
When PHP 4.0 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 PHP 4.0 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to PHP 8.5 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does PHP 4.0 reach end of life?
PHP 4.0 reached end of life on June 23, 2001. This version is no longer receiving security patches.
Is PHP 4.0 still supported?
No. PHP 4.0 reached end of life on June 23, 2001 and is no longer receiving security patches.
What should I upgrade to from PHP 4.0?
The recommended upgrade from PHP 4.0 is
PHP 8.5 — the latest actively supported version. Check the
PHP full timeline for all supported versions.
What are the security risks of running PHP 4.0 past EOL?
Since PHP 4.0 reached end of life, the maintainers no longer issue 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 PHP should migrate immediately or implement compensating controls.
Does PHP track end-of-life by point release (e.g. PHP 8.5.1, PHP 8.5.2)?
No — PHP end-of-life dates apply to the entire 8.5.x release series, not individual point releases. A point release like PHP 8.5.1 or PHP 8.5.2 shares the same EOL date as PHP 8.5. Security patches stop for the entire 8.5.x line on that date, regardless of which patch version you are running. Check the table above for EOL dates by major version series.