CVE-2025-23016 :: Enginsight Vulnerability Database

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
mitre	CNA	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

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
fastcgi	fcgi	2.0.0 ≤ 𝑥 ≤ 2.4.4	CNA

Common Weakness Enumeration

CWE-190 - Integer Overflow or Wraparound
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.

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