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.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the affected perl-FCGI package.
- Update the libfcgi-perl package.
- Consult vendor advisories for specific update guidance.
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 |
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.
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