CVE-2024-4577criticalunder attackransomwareCWE-78

CVE-2024-4577: critical vulnerability in PHP

Argument Injection in PHP-CGI

Published 09 Jun 2024 · Updated 21 Oct 2025

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100Vexday Risk Score

Patch now. It under exploitation confirmed by CISA and has a working public exploit.

ssvc Actcvss 9.8epss 100%

from disclosure to weaponsame day

Published on NVDJun 9

1st PoCJan 13

metasploitJun 6

CISA KEV+3d

What the vendors declare (VEX)

Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.

Red HatVEX document ↗

Not affected

5 products (299 components) — because the vulnerable code is not present in the product

Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Enterprise Linux 6 · Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 7

Action required by CISAfederal deadline: 2024-07-03

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

In short

PHP-CGI on Windows can be tricked into accepting malicious command-line options through character encoding tricks, allowing attackers to expose source code or run arbitrary code on the server.

Technical detail

An argument injection vulnerability in PHP-CGI on Windows occurs when Apache passes user input through the CGI interface; if Windows code page settings enable 'Best-Fit' character mapping, specially crafted input can be reinterpreted as PHP options (e.g., -r, -d), bypassing normal request handling. Requires specific Windows code page configuration and vulnerable PHP versions; impact includes arbitrary code execution and information disclosure.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

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

Affected products

PHP Group · PHP

public PoCs found — 157

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References

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://blog.talosintelligence.com/new-persistent-attacks-japan/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/