CVE-2024-4577

PHP-CGI OS Command Injection Vulnerability

IN CISA KEV

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.

Vendor: PHP Group
Product: PHP
CVSS 3.1: 9.8 (critical), scored by NVD (primary)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1: 9.8 (critical), scored by security@php.netCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-78
Published: 2024-06-09
NVD modified: 2026-06-17
NVD status: Analyzed

CISA KEV

Date added: 2024-06-12
Due date: 2024-07-03
Ransomware use: Known
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

EPSS

100% chance of exploitation in the next 30 days (percentile 99th)

FIRST EPSS, updated 17 Oct 2026. About EPSS

CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.

References

www.openwall.com (Mailing List, Third Party Advisory)
blog.orange.tw (Third Party Advisory)
cert.be (Third Party Advisory)
lists.fedoraproject.org (Mailing List)
lists.fedoraproject.org (Mailing List)
security.netapp.com (Third Party Advisory)
www.imperva.com (Third Party Advisory)
www.php.net (Release Notes)
www.php.net (Release Notes)
www.php.net (Release Notes)
www.openwall.com (Mailing List, Third Party Advisory)
blog.orange.tw (Third Party Advisory)

Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.