The memory_limit functionality in PHP 4.x up to 4.3.7, and 5.x up to 5.0.0RC3, under certain conditions such as when register_globals is enabled, allows remote attackers to execute arbitrary code by triggering a memory_limit abort during execution of the zend_hash_init function and overwriting a HashTable destructor pointer before the initialization of key data structures is complete.
Conclusion & alert: CVE-2004-0594 is rated High Exploit Risk (65/100): CVSS Medium severity, with high exploitation likelihood (EPSS 54.86%, 99th percentile). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| 660 | exploit_db | edb | 2004-11-27 | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 77.73% | 54.86% | -22.88% |
| 2 | 2025-12-28 | 78.00% | 77.73% | -0.27% |
| 3 | 2025-12-27 | — | 78.00% | — |
Full EPSS history (18 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.1 | 2.0 | MEDIUM |
|
4.9 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2004-0594 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| openpkg | openpkg | 2.0 | cpe:2.3:a:openpkg:openpkg:2.0:*:*:*:*:*:*:* |
| openpkg | openpkg | 2.1 | cpe:2.3:a:openpkg:openpkg:2.1:*:*:*:*:*:*:* |
| avaya | converged_communications_server | 2.0 | cpe:2.3:h:avaya:converged_communications_server:2.0:*:*:*:*:*:*:* |
| debian | debian_linux | 3.0 | cpe:2.3:o:debian:debian_linux:3.0:*:*:*:*:*:*:* |
| hp | hp-ux | b.11.00 | cpe:2.3:o:hp:hp-ux:b.11.00:*:*:*:*:*:*:* |
| hp | hp-ux | b.11.11 | cpe:2.3:o:hp:hp-ux:b.11.11:*:*:*:*:*:*:* |
| hp | hp-ux | b.11.22 | cpe:2.3:o:hp:hp-ux:b.11.22:*:*:*:*:*:*:* |
| hp | hp-ux | b.11.23 | cpe:2.3:o:hp:hp-ux:b.11.23:*:*:*:*:*:*:* |
| trustix | secure_linux | 1.5 | cpe:2.3:o:trustix:secure_linux:1.5:*:*:*:*:*:*:* |
| trustix | secure_linux | 2.0 | cpe:2.3:o:trustix:secure_linux:2.0:*:*:*:*:*:*:* |
| trustix | secure_linux | 2.1 | cpe:2.3:o:trustix:secure_linux:2.1:*:*:*:*:*:*:* |
| php | php | >= 4.0, < 4.3.7 | cpe:2.3:a:php:php:*:*:*:*:*:*:*:* |
| php | php | 5.0.0 | cpe:2.3:a:php:php:5.0.0:beta1:*:*:*:*:*:* |
| php | php | 5.0.0 | cpe:2.3:a:php:php:5.0.0:beta2:*:*:*:*:*:* |
| php | php | 5.0.0 | cpe:2.3:a:php:php:5.0.0:beta3:*:*:*:*:*:* |
| php | php | 5.0.0 | cpe:2.3:a:php:php:5.0.0:beta4:*:*:*:*:*:* |
| php | php | 5.0.0 | cpe:2.3:a:php:php:5.0.0:rc1:*:*:*:*:*:* |
| php | php | 5.0.0 | cpe:2.3:a:php:php:5.0.0:rc2:*:*:*:*:*:* |