CVE-2025-40907

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 v3.1

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

EPSS

0.65% chance of exploitation in the next 30 days, 49th percentile

Published

2025-05-16

Updated

2025-09-05

Proof-of-concept exploits (1)

• FastCGI-Archives/fcgi2/issues/67

References

• CVE Record
• NVD entry

Related

• CVE-2025-40843
• CVE-2025-40909
• CVE-2025-4080
• CVE-2025-4094
• CVE-2025-4079
• CVE-2025-41067