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

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 functi

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
PHP Group	PHP	8.1.*, 8.2.*, 8.3.*

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2024-06-12. Ransomware use: Known.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2024-06-09T19:42:36.464Z
• Last modified: 2025-10-21T23:05:16.089Z
• Added to CISA KEV: 2024-06-12
• BOD 22-01 due: 2024-07-03

09References

• github.com — https://github.com/php/php-src/security/advisories/GHSA-3qgc-jrrr-25jv
• blog.orange.tw — https://blog.orange.tw/2024/06/cve-2024-4577-yet-another-php-rce.html
• devco.re — https://devco.re/blog/2024/06/06/security-alert-cve-2024-4577-php-cgi-argument-i…
• arstechnica.com — https://arstechnica.com/security/2024/06/php-vulnerability-allows-attackers-to-r…
• www.imperva.com — https://www.imperva.com/blog/imperva-protects-against-critical-php-vulnerability…
• github.com — https://github.com/11whoami99/CVE-2024-4577
• github.com — https://github.com/xcanwin/CVE-2024-4577-PHP-RCE
• github.com — https://github.com/rapid7/metasploit-framework/pull/19247
• labs.watchtowr.com — https://labs.watchtowr.com/no-way-php-strikes-again-cve-2024-4577/
• github.com — https://github.com/watchtowrlabs/CVE-2024-4577
• www.php.net — https://www.php.net/ChangeLog-8.php#8.1.29
• www.php.net — https://www.php.net/ChangeLog-8.php#8.2.20
• www.php.net — https://www.php.net/ChangeLog-8.php#8.3.8
• cert.be — https://cert.be/en/advisory/warning-php-remote-code-execution-patch-immediately
• isc.sans.edu — https://isc.sans.edu/diary/30994
• www.openwall.com — http://www.openwall.com/lists/oss-security/2024/06/07/1
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…
• security.netapp.com — https://security.netapp.com/advisory/ntap-20240621-0008/