CVE-2025-23016

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.

Published: 2025-01-10 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-23016 is rated Moderate Risk (43.3/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.06%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-23016

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-08-06 0.04% 0.06% +0.01%
2 2025-01-11 — 0.04% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-23016

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 3.1 CRITICAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.5 6.0 [email protected]

Weakness enumeration for CVE-2025-23016

OS Trackers for CVE-2025-23016

vendor priority summary link
alpine critical CVE-2025-23016: 1 source package rows (fcgi); 6 state rows across 4 repos (3.19-main, 3.20-main, 3.21-main, edge-main); fixed 0, open 6. https://security.alpinelinux.org/vuln/CVE-2025-23016
debian not yet assigned CVE-2025-23016 not yet assigned priority: Debian including 1 source packages (libfcgi), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-23016
suse high CVE-2025-23016 severity important: SUSE including 13 source package names (FastCGI-2.4.0-150000.4.3.1, FastCGI-2.4.6-1.1, …), 78 product×package rows across 21 product lines (SUSE Enterprise Storage 7.1, SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS, … (21 product lines)): Fixed 78. https://www.suse.com/security/cve/CVE-2025-23016/
ubuntu medium CVE-2025-23016 medium priority: Ubuntu including 1 source packages (libfcgi), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): released 6, needed 3. https://ubuntu.com/security/CVE-2025-23016

Affected software / configurations for CVE-2025-23016

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-23016

cvelogic Threat Intelligence