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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fastcgi | Fcgi | >= 0.44, <= 0.82 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2025/04/23/4Mailing ListThird Party Advisory
- https://github.com/FastCGI-Archives/fcgi2/issues/67ExploitIssue Tracking
- https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5Release Notes
- https://github.com/perl-catalyst/FCGI/issues/14ExploitIssue Tracking
- https://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patcPatch
- https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-ExploitThird Party Advisory
FAQ
What is CVE-2025-40907?
CVE-2025-40907 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 overfl...
How severe is CVE-2025-40907?
CVE-2025-40907 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-40907?
Check the references section above for vendor advisories and patch information. Affected products include: Fastcgi Fcgi.