How severe is CVE-2004-0594?

CVE-2004-0594 has a CVSS 2.0 base score of 5.1, rated medium severity.

Is CVE-2004-0594 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0594?

CVE-2004-0594 primarily affects Openpkg. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-0594?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2004-0594 published?

CVE-2004-0594 was published on 2004-07-27 and last updated on 2026-06-16.

CVE-2004-0594

CVE-2004-0594 is a medium-severity vulnerability in Openpkg with a CVSS 2.0 base score of 5.1. Its EPSS exploit-prediction score of 55% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-367.

Key facts

Severity: Medium (CVSS 2.0 base score 5.1)
EPSS exploit prediction: 55% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-367
Affected product: Openpkg
Published: 2004-07-27
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2004-0594?: 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.
How severe is CVE-2004-0594?: CVE-2004-0594 has a CVSS 2.0 base score of 5.1, rated medium severity.
Is CVE-2004-0594 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0594?: CVE-2004-0594 primarily affects Openpkg. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-0594?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-0594 published?: CVE-2004-0594 was published on 2004-07-27 and last updated on 2026-06-16.

References

Affected products (18)

cpe:2.3:a:openpkg:openpkg:2.0:*:*:*:*:*:*:*
cpe:2.3:a:openpkg:openpkg:2.1:*:*:*:*:*:*:*
cpe:2.3:h:avaya:converged_communications_server:2.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:3.0:*:*:*:*:*:*:*
cpe:2.3:o:hp:hp-ux:b.11.00:*:*:*:*:*:*:*
cpe:2.3:o:hp:hp-ux:b.11.11:*:*:*:*:*:*:*
cpe:2.3:o:hp:hp-ux:b.11.22:*:*:*:*:*:*:*
cpe:2.3:o:hp:hp-ux:b.11.23:*:*:*:*:*:*:*
cpe:2.3:o:trustix:secure_linux:1.5:*:*:*:*:*:*:*
cpe:2.3:o:trustix:secure_linux:2.0:*:*:*:*:*:*:*
cpe:2.3:o:trustix:secure_linux:2.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:beta3:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:beta4:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:rc2:*:*:*:*:*:*

More vulnerabilities in Openpkg

CVE-2004-0990 — Critical (CVSS 10.0): Integer overflow in GD Graphics Library libgd 2.0.28 (libgd2), and possibly other versions, allows remote attackers to…
CVE-2004-1019 — Critical (CVSS 10.0): The deserialization code in PHP before 4.3.10 and PHP 5.x up to 5.0.2 allows remote attackers to cause a denial of…
CVE-2004-1012 — Critical (CVSS 10.0): The argument parser of the PARTIAL command in Cyrus IMAP Server 2.2.6 and earlier allows remote authenticated users to…
CVE-2004-1011 — Critical (CVSS 10.0): Stack-based buffer overflow in Cyrus IMAP Server 2.2.4 through 2.2.8, with the imapmagicplus option enabled, allows…
CVE-2004-1013 — Critical (CVSS 10.0): The argument parser of the FETCH command in Cyrus IMAP Server 2.2.x through 2.2.8 allows remote authenticated users to…
CVE-2004-1065 — Critical (CVSS 10.0): Buffer overflow in the exif_read_data function in PHP before 4.3.10 and PHP 5.x up to 5.0.2 allows remote attackers to…

All CVEs affecting Openpkg →

Other CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition) vulnerabilities

CVE-2026-25641 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, there is a sandbox escape vulnerability due to a…
CVE-2025-64180 — Critical (CVSS 10.0): Manager-io/Manager is accounting software. In Manager Desktop and Server versions 25.11.1.3085 and below, a critical…
CVE-2025-34027 — Critical (CVSS 10.0): The Versa Concerto SD-WAN orchestration platform is vulnerable to an authentication bypass in the Traefik reverse proxy…
CVE-2026-25052 — Critical (CVSS 9.9): n8n is an open source workflow automation platform. Prior to versions 1.123.18 and 2.5.0, a vulnerability in the file…
CVE-2025-13032 — Critical (CVSS 9.9): Double fetch in sandbox kernel driver in Avast/AVG Antivirus <25.3 on windows allows local attacker to escalate…
CVE-2026-53838 — Critical (CVSS 9.8): OpenClaw before 2026.5.27 contains a state mutation vulnerability in node pairing reconnection that allows paired nodes…

Browse all CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition) vulnerabilities →