CVE-2024-4577

CRITICAL CISA KEV
Published Jun 9, 2024 Modified Nov 3, 2025 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.

CVSS v3.1 Score

9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Jun 12, 2024 Remediation due: Jul 3, 2024 Known ransomware use

Weakness Type (CWE)

CWE-78 OS Command Injection

Affected Products

Vendor Product
php php
php php
php php
microsoft windows
fedoraproject fedora
fedoraproject fedora

References

Exploits

https://arstechnica.com/security/2024/06/php-vulnerability-allows-attackers-to-run-malicious-code-on-windows-servers/ 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/ https://arstechnica.com/security/2024/06/php-vulnerability-allows-attackers-to-run-malicious-code-on-windows-servers/ https://blog.talosintelligence.com/new-persistent-attacks-japan/ 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/ https://www.vicarius.io/vsociety/posts/php-cgi-argument-injection-to-rce-cve-2024-4577 https://www.vicarius.io/vsociety/posts/php-cgi-os-command-injection-vulnerability-cve-2024-4577

Frequently Asked Questions

What is CVE-2024-4577? +
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. It has a CVSS v3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
How severe is CVE-2024-4577? +
CVE-2024-4577 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.
What products are affected by CVE-2024-4577? +
CVE-2024-4577 affects products from fedoraproject, microsoft, php, specifically: fedora, php, windows. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-4577? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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