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CVE-2024-4577

PHP-CGI OS Command Injection Vulnerability

PHP Group PHP CWE-78

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 Score
9.8
Critical
EPSS — Exploit Probability
100%
Riskier than 100% of all CVEs
Exploitation
Confirmed in the wild
Used in ransomware campaigns
Remediation
Patch available
Federal deadline 2024-07-03
CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Deadline for federal agencies: 2024-07-03.

NVD entry Vendor patch PoC / advisory CISA KEV

1 article across 1 outlet · first covered Apr 30, 2026 · latest Apr 30, 2026

Coverage timeline