5.3
MEDIUM
CVE-2025-40907
Apache FCGI Perl Integer Overflow Buffer Overflow Vulnerability
Description

FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library. The included FastCGI library is affected by CVE-2025-23016, causing an integer overflow (and resultant heap-based buffer overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in fcgiapp.c.

INFO

Published Date :

May 16, 2025, 1:15 p.m.

Last Modified :

July 2, 2025, 1:01 a.m.

Source :

9b29abf9-4ab0-4765-b253-1875cd9b441e

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2025-40907 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fastcgi fcgi
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-40907.

URL Resource
http://www.openwall.com/lists/oss-security/2025/04/23/4 Mailing List Third Party Advisory
https://github.com/FastCGI-Archives/fcgi2/issues/67 Exploit Issue Tracking
https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5 Release Notes
https://github.com/perl-catalyst/FCGI/issues/14 Exploit Issue Tracking
https://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patch Patch
https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library Exploit Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-40907 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2025-40907 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jul. 02, 2025

    Action Type Old Value New Value
    Added CWE CWE-190
    Added CPE Configuration OR *cpe:2.3:a:fastcgi:fcgi:*:*:*:*:*:perl:*:* versions from (including) 0.44 up to (including) 0.82
    Added Reference Type CPANSec: http://www.openwall.com/lists/oss-security/2025/04/23/4 Types: Mailing List, Third Party Advisory
    Added Reference Type CPANSec: https://github.com/FastCGI-Archives/fcgi2/issues/67 Types: Exploit, Issue Tracking
    Added Reference Type CPANSec: https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5 Types: Release Notes
    Added Reference Type CPANSec: https://github.com/perl-catalyst/FCGI/issues/14 Types: Exploit, Issue Tracking
    Added Reference Type CPANSec: https://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patch Types: Patch
    Added Reference Type CPANSec: https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library Types: Exploit, Third Party Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    May. 16, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  • New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e

    May. 16, 2025

    Action Type Old Value New Value
    Added Description FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library. The included FastCGI library is affected by CVE-2025-23016, causing an integer overflow (and resultant heap-based buffer overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in fcgiapp.c.
    Added Reference http://www.openwall.com/lists/oss-security/2025/04/23/4
    Added Reference https://github.com/FastCGI-Archives/fcgi2/issues/67
    Added Reference https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5
    Added Reference https://github.com/perl-catalyst/FCGI/issues/14
    Added Reference https://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patch
    Added Reference https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-40907 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-40907 weaknesses.

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability