CVE-2024-4577

CVE-2024-4577 is a critical-severity vulnerability in Php with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2024-06-12). The underlying weakness is classified as CWE-78.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• EPSS exploit prediction: 100% (100th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2024-06-12)
• EU (EUVD) id: EUVD-2024-44188
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2024-06-12)
• Weakness: CWE-78
• Affected product: Php
• Published: 2024-06-09
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2024-4577?

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.

How severe is CVE-2024-4577?

CVE-2024-4577 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-4577 being actively exploited?

Yes. CVE-2024-4577 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-06-12, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2024-4577?

CVE-2024-4577 primarily affects Php. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-4577?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2024-4577 have an EU (EUVD) identifier?

Yes. CVE-2024-4577 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-44188. It is also flagged as exploited in the EUVD (since 2024-06-12).

When was CVE-2024-4577 published?

CVE-2024-4577 was published on 2024-06-09 and last updated on 2026-06-17.

References

• http://www.openwall.com/lists/oss-security/2024/06/07/1
• 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://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/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/PKGTQUOA2NTZ3RXN22CSAUJPIRUYRB4B/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/W45DBOH56NQDRTOM2DN2LNA2FZIMC3PK/
• https://security.netapp.com/advisory/ntap-20240621-0008/
• https://www.imperva.com/blog/imperva-protects-against-critical-php-vulnerability-cve-2024-4577/
• https://www.php.net/ChangeLog-8.php#8.1.29
• https://www.php.net/ChangeLog-8.php#8.2.20
• https://www.php.net/ChangeLog-8.php#8.3.8
• https://blog.talosintelligence.com/new-persistent-attacks-japan/
• https://www.vicarius.io/vsociety/posts/php-cgi-argument-injection-to-rce-cve-2024-4577
• https://www.vicarius.io/vsociety/posts/php-cgi-os-command-injection-vulnerability-cve-2024-4577
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-4577

Affected products (3)

• cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:*

More vulnerabilities in Php

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• CVE-2012-2376 — Critical (CVSS 10.0): Buffer overflow in the com_print_typeinfo function in PHP 5.4.3 and earlier on Windows allows remote attackers to…
• CVE-2011-3268 — Critical (CVSS 10.0): Buffer overflow in the crypt function in PHP before 5.3.7 allows context-dependent attackers to have an unspecified…
• CVE-2009-4143 — Critical (CVSS 10.0): PHP before 5.2.12 does not properly handle session data, which has unspecified impact and attack vectors related to (1)…
• CVE-2008-5557 — Critical (CVSS 10.0): Heap-based buffer overflow in ext/mbstring/libmbfl/filters/mbfilter_htmlent.c in the mbstring extension in PHP 4.3.0…

All CVEs affecting Php →

Other CWE-78 (OS Command Injection) vulnerabilities

• CVE-2026-19188 — Critical (CVSS 10.0): A critical OS command injection vulnerability has been identified in the Haiwell IoT Cloud HMI Gateway product. The…
• CVE-2026-48362 — Critical (CVSS 10.0): ColdFusion is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')…
• CVE-2026-16812 — Critical (CVSS 10.0): VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access…
• CVE-2026-6516 — Critical (CVSS 10.0): Zohocorp ManageEngine ADAudit Plus versions before 8606 are affected by Unauthenticated Remote code execution due to…
• CVE-2026-46339 — Critical (CVSS 10.0): 9Router is an AI router & token saver. From 0.4.30 until 0.4.37, 9Router's src/proxy.js middleware did not protect…
• CVE-2026-59726 — Critical (CVSS 10.0): Ruflo is an agent meta-harness for Claude Code and Codex. Prior to 3.16.3, ruflo's default docker-compose deployment…

Browse all CWE-78 (OS Command Injection) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 47.95.209.49 (ipv4-addr)
• 41.33.91.226 (ipv4-addr)
• 39.164.91.67 (ipv4-addr)
• 160.155.68.8 (ipv4-addr)
• 151.80.61.151 (ipv4-addr)
• 45.177.210.193 (ipv4-addr)
• 161.132.53.68 (ipv4-addr)
• 47.95.204.73 (ipv4-addr)