CVE-2025-23016CRITICAL 9.3EPSS p42.2%

CVE-2025-23016CVE-2025-23016

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.

Scoring

CVSS 3.19.3 (CRITICAL)
VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS0.56% probability of exploitation · percentile 42.2% · 2026-06-19T12:03:05Z
Published2025-01-10
Last modified2026-04-15

Underlying weaknesses· 1

CWE-190

References

  1. https://github.com/FastCGI-Archives/fcgi2/issues/67
  2. https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5
  3. https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library
  4. http://www.openwall.com/lists/oss-security/2025/04/23/4
  5. https://lists.debian.org/debian-lts-announce/2025/10/msg00009.html
  6. https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library

1

TypeTargetConfidenceTier
WeaknessInteger Overflow or Wraparoundcwe-1900%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.