CVE-2025-40907

5.3 mediumEPSS 0.7%

Medium (5.3) in fastcgi fcgi. EPSS 0.7% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.3 medium

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

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)
CWEs: CWE-190, CWE-122
Published: 2025-05-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

fastcgi:fcgi

References

http://www.openwall.com/lists/oss-security/2025/04/23/4
https://github.com/FastCGI-Archives/fcgi2/issues/67
https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5
https://github.com/perl-catalyst/FCGI/issues/14
https://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patch

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