PHP-CGI argument injection on Windows (CVE-2024-4577)
PHP Group PHP
A bypass of the old CVE-2012-1823 fix: on Windows, PHP's 'Best-Fit' character mapping let attackers inject arguments into PHP running in CGI mode (including default XAMPP setups) and execute code remotely. Found by Orange Tsai (DEVCORE) and fixed in PHP 8.3.8, 8.2.20 and 8.1.29. Exploitation, including by ransomware operators, followed within days. Added to the CISA KEV catalog on 2024-06-12. CISA lists known use in ransomware campaigns.
Why this severity: CVSS 9.8 (v3.1, CNA), actively exploited (CISA KEV); known ransomware use
- Started
- Jun 6, 2024
- Closed
- Jun 12, 2024
Affected
- PHP < 8.3.8, < 8.2.20, < 8.1.29 (GitHub advisory); exploitable on Windows in CGI mode
Fixed in
- 8.3.8
- 8.2.20
- 8.1.29
Updates by day3
Advisories4
News & write-ups1
Notes & caveats
Derived from the CISA KEV JSON feed (catalogVersion 2026.10.21); CVSS from the CVE record (cveawg.mitre.org). startedAt is the CVE publication date when it fell in 2024 before the KEV listing, else the KEV dateAdded; exploitation may have begun earlier. closedAt is the KEV listing date (a fix or mitigation was available then unless noted).
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