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CVE-2025-40907

5.3 · MEDIUM

FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library.

Published May 16, 2025CWE-122EPSS 0.68%

Overview

CVE-2025-40907 is a medium-severity vulnerability. It was published on May 16, 2025 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2025/04/23/4GitHubgithub.com/FastCGI-Archives/fcgi2/issues/67GitHubgithub.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5GitHubgithub.com/perl-catalyst/FCGI/issues/14Refpatch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patchRefwww.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library

How CyberStrike helps

Frequently asked questions

What is CVE-2025-40907?

CVE-2025-40907 is a medium-severity vulnerability. It was published on May 16, 2025 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-40907?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-40907?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-40907?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-40907 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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