How severe is CVE-2004-1020?

CVE-2004-1020 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2004-1020 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-1020?

CVE-2004-1020 primarily affects Php. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-1020?

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

When was CVE-2004-1020 published?

CVE-2004-1020 was published on 2005-01-10 and last updated on 2026-06-16.

CVE-2004-1020

CVE-2004-1020 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Php
Published: 2005-01-10
Last modified: 2026-06-16

Description

The addslashes function in PHP 4.3.9 does not properly escape a NULL (/0) character, which may allow remote attackers to read arbitrary files in PHP applications that contain a directory traversal vulnerability in require or include statements, but are otherwise protected by the magic_quotes_gpc mechanism. NOTE: this issue was originally REJECTed by its CNA before publication, but that decision is in active dispute. This candidate may change significantly in the future as a result of further discussion.

Frequently asked questions

What is CVE-2004-1020?: The addslashes function in PHP 4.3.9 does not properly escape a NULL (/0) character, which may allow remote attackers to read arbitrary files in PHP applications that contain a directory traversal vulnerability in require or include statements, but are otherwise protected by the magic_quotes_gpc mechanism. NOTE: this issue was originally REJECTed by its CNA before publication, but that decision is in active dispute. This candidate may change significantly in the future as a result of further discussion.
How severe is CVE-2004-1020?: CVE-2004-1020 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2004-1020 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-1020?: CVE-2004-1020 primarily affects Php. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-1020?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-1020 published?: CVE-2004-1020 was published on 2005-01-10 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:a:php:php:4.3.6:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.7:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.8:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.9:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0:rc2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0:rc3:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.2:*:*:*:*:*:*:*

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