The ip2long function in PHP 5.1.4 and earlier may incorrectly validate an arbitrary string and return a valid network IP address, which…

Description

The ip2long function in PHP 5.1.4 and earlier may incorrectly validate an arbitrary string and return a valid network IP address, which allows remote attackers to obtain network information and facilitate other attacks, as demonstrated using SQL injection in the X-FORWARDED-FOR Header in index.php in MiniBB 2.0. NOTE: it could be argued that the ip2long behavior represents a risk for security-relevant issues in a way that is similar to strcpy's role in buffer overflows, in which case this would be a class of implementation bugs that would require separate CVE items for each PHP application that uses ip2long in a security-relevant manner.

Scores

EPSS (exploitation in 30 days)

5.7% · top 6.9% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.

Weakness

• n/a

Affected products

• n/a

  • affected n/a

References (4)

• 20060729 Re: PHP ip2long() function circumvention (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• 20060729 PHP ip2long() function circumvention (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• http://retrogod.altervista.org/php_ip2long.htm (opens in a new tab)x_refsource_MISCx_transferred
• 1016609 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2006-4023](https://trackcve.app/badge/CVE-2006-4023.svg)](https://trackcve.app/cve/CVE-2006-4023)

Record last updated 7 Aug 2024, 18:57 UTC.