What’s Vulnerable › Vulnerabilities

CVE-2025-23016

• Severity: critical (CVSS 9.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-10 · updated 2026-06-17
• Weakness: CWE-190

Description

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.

Affected products

• FastCGI fcgi: from 2.0.0 through 2.4.4

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

Get alerted when CVE-2025-23016 or the next vulnerability affects your stack