Input validation error in PHP - CVE-2004-1018

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Main Vulnerability Database Vulnerabilities #VU110512

Input validation error in PHP - CVE-2004-1018

Published: December 8, 2020 / Updated: June 13, 2025


Vulnerability identifier: #VU110512
CSH Severity: High
CVSS v4.0:
CVE-ID: CVE-2004-1018
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: Public exploit is available
Vendor: PHP Group
Affected software:
PHP

Detailed vulnerability description

The vulnerability allows attackers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can bypass safe mode restrictions, cause a denial of service, or execute arbitrary code via (1) a negative offset value to the shmop_write function, (2) an "integer overflow/underflow" in the pack function, or (3) an "integer overflow/underflow" in the unpack function. NOTE: this issue was originally REJECTed by its CNA before publication, but that decision is in active dispute.


How to mitigate CVE-2004-1018

Install update from vendor's website.

Sources