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CVE-2024-4577: PHP-CGI OS Command Injection Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2024-06-12
• EPSS: 100.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-06-09 · updated 2026-06-17
• Weakness: CWE-78

Description

In PHP versions 8.1.* before 8.1.29, 8.2.* before 8.2.20, 8.3.* before 8.3.8, when using Apache and PHP-CGI on Windows, if the system is set up to use certain code pages, Windows may use "Best-Fit" behavior to replace characters in command line given to Win32 API functions. PHP CGI module may misinterpret those characters as PHP options, which may allow a malicious user to pass options to PHP binary being run, and thus reveal the source code of scripts, run arbitrary PHP code on the server, etc.

Affected products

• Fedoraproject Fedora: 39, 40
• PHP: from 8.1.0 before 8.1.29; from 8.2.0 before 8.2.20; from 8.3.0 before 8.3.8 — fixed in 8.1.29, 8.2.20, 8.3.8

How to fix

Upgrade to a fixed version: PHP 8.1.29, 8.2.20, 8.3.8. Check the vendor advisory for mitigations.

In the news

• php2shell (CVE-2026-109618, CVE-2026-109619): Frequently asked questions about critical PHP remote code execution vulnerabilities

References

• http://www.openwall.com/lists/oss-security/2024/06/07/1
• https://arstechnica.com/security/2024/06/php-vulnerability-allows-attackers-to-run-malicious-code-on-windows-servers/
• https://blog.orange.tw/2024/06/cve-2024-4577-yet-another-php-rce.html
• https://cert.be/en/advisory/warning-php-remote-code-execution-patch-immediately
• https://devco.re/blog/2024/06/06/security-alert-cve-2024-4577-php-cgi-argument-injection-vulnerability-en/
• https://github.com/11whoami99/CVE-2024-4577
• https://github.com/php/php-src/security/advisories/GHSA-3qgc-jrrr-25jv
• https://github.com/rapid7/metasploit-framework/pull/19247
• https://github.com/watchtowrlabs/CVE-2024-4577
• https://github.com/xcanwin/CVE-2024-4577-PHP-RCE
• https://isc.sans.edu/diary/30994
• https://labs.watchtowr.com/no-way-php-strikes-again-cve-2024-4577/

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