CVE-2025-40907

MEDIUM

FCGI 0.44-0.82 - Integer Overflow via Crafted nameLen or valueLen in IPC Socket Data

Title source: llm

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.

References (6)

Core 6

Core References

Mailing List, Third Party Advisory mailing-list

http://www.openwall.com/lists/oss-security/2025/04/23/4

Exploit, Issue Tracking issue-tracking

https://github.com/FastCGI-Archives/fcgi2/issues/67

Release Notes patch

https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5

Exploit, Third Party Advisory technical-description

https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library

Exploit, Issue Tracking issue-tracking

https://github.com/perl-catalyst/FCGI/issues/14

Patch patch

https://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patch

Scores

CVSS v3 5.3

EPSS 0.0052

EPSS Percentile 39.7%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-122 CWE-190

Status published

Products (1)

fastcgi/fcgi 0.44 - 0.82

Published May 16, 2025

Tracked Since Feb 18, 2026