CVE-2025-23016

EUVD-2025-3075
FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has 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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.3 CRITICAL
LOCAL
LOW
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
mitreCNA
9.3 CRITICAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 24%
Common Weakness Enumeration
References
https://github.com/FastCGI-Archives/fcgi2/issues/67
https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5
https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library
http://www.openwall.com/lists/oss-security/2025/04/23/4
https://lists.debian.org/debian-lts-announce/2025/10/msg00009.html
https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library