How severe is CVE-2024-4577?

CVE-2024-4577 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2024-4577?

Affected package information for CVE-2024-4577 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2024-4577?

No fixed version has been published for CVE-2024-4577 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2024-4577 actively exploited in the wild?

Yes. There are 57 known exploit references for CVE-2024-4577, including 1 documented proof-of-concept exploit on Exploit-DB and 33 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2024-4577?

CVE-2024-4577 has an EPSS (Exploit Prediction Scoring System) score of 94.4%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2024-4577 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2024-4577 (PHP-CGI OS Command Injection Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2024-06-12. CISA required all US federal civilian agencies to remediate this vulnerability by 2024-07-03. The required action was: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. This CVE has been used in known ransomware campaigns. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

Is there exploit tooling available for CVE-2024-4577?

A Nuclei detection template exists for CVE-2024-4577, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2024-4577 published, and has it been updated?

CVE-2024-4577 was published on June 9, 2024 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2024-06-12 — agencies required to remediate by 2024-07-03 · Ransomware

CVE-2024-4577

CRITICAL

Also known asBIT-libphp-2024-4577BIT-php-2024-4577BIT-php-min-2024-4577

Published

Jun 9, 2024

Updated

Apr 10, 2026

Affected

0 pkgs

Patched

None yet

Exploits

57 known

EPSS Exploitation Probability

via FIRST.org ↗

94.4%probability of exploitation in next 30 days

Very High Risk100th percentile-0.02%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-52331webappsphp

PHP CGI Module 8.3.4 - Remote Code Execution (RCE)

by İbrahimsql · Jun 15, 2025

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2024-4577 in your stack?

O3 detects CVE-2024-4577 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

9.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction

None

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaponization

OpenSSF Scorecard

Package health score

metasploit-framework

4.6/10

Code-Review6/10

Maintained10/10

Branch-ProtectionN/A

Assessed Jun 1, 2026

Timeline

Disclosed

Jun 9, 2024

KEV added

Jun 12, 2024

First exploit

Jun 15, 2025

Last updated

Apr 10, 2026

Identifiers

CVE-2024-4577

BIT-libphp-2024-4577

BIT-php-2024-4577

BIT-php-min-2024-4577

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.