CVE-2025-23016

CRITICAL

FastCGI fcgi 2.0.0-2.4.4 - Heap-Based Buffer Overflow via Crafted nameLen or valueLen in IPC Socket

Title source: llm

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.

References (5)

Core 5

Core References

Mailing List

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

Various Sources

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

Mailing List

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

Issue Tracking

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

Release Notes

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

Scores

CVSS v3 9.3

EPSS 0.0056

EPSS Percentile 42.1%

Attack Vector LOCAL

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-190

Status published

Products (1)

FastCGI/fcgi 2.0.0 - 2.4.4

Published Jan 10, 2025

Tracked Since Feb 18, 2026