by Kastro
Paper/Archive/CVE-2025-23016

CVE-2025-23016

FastCGI fcgi — FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based buffer overflow) via crafted nameLen or valu…

EPSS 0.6%public exploitCVSS 9.3
critical.is priorityof 100
48
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 49.4.494 × 209.9Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
fcgi2.0.0 – 2.4.4–CNA

Scores by source

mitre (CNA)9.3CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

refgithub.com/FastCGI-Archives/fcgi2/issues/67refgithub.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5exploitsynacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-libraryrefopenwall.com/lists/oss-security/2025/04/23/4reflists.debian.org/debian-lts-announce/2025/10/msg00009.html