CVE-2025-23016

9.3 CRITICAL

Published: January 10, 2025 Modified: November 03, 2025

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/FastCGI-Archives/fcgi2/issues/67

Source: cve@mitre.org

https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5

Source: cve@mitre.org

https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library

Source: cve@mitre.org

http://www.openwall.com/lists/oss-security/2025/04/23/4

Source: af854a3a-2127-422b-91ae-364da2661108

https://lists.debian.org/debian-lts-announce/2025/10/msg00009.html

Source: af854a3a-2127-422b-91ae-364da2661108

https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

6 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.3 / 10.0

EPSS (Exploit Probability)

0.1%

21th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-190

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