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CVE-2025-40907— FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library

Quick assessment

Affected
ETHER FCGI
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

fcgi2是FastCGI-Archives开源的一个 FastCGI 开发人员工具包。 fcgi2 0.44至0.82版本存在安全漏洞，该漏洞源于FastCGI库存在整数溢出，可能导致堆缓冲区溢出。

AI Predicted 9.8 Difficulty: Easy EPSS 0.64% · P48

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-40907

Vulnerability Information
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Vulnerability Title
FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library
Source: CVE Program / CVE List V5
Vulnerability Description
FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library. The included FastCGI library is affected by CVE-2025-23016, causing 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1395
Source: CVE Program / CVE List V5
Vulnerability Title
fcgi2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fcgi2是FastCGI-Archives开源的一个 FastCGI 开发人员工具包。 fcgi2 0.44至0.82版本存在安全漏洞，该漏洞源于FastCGI库存在整数溢出，可能导致堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ETHER FCGI 0.44 ~ 0.82 -

II. Public POCs for CVE-2025-40907

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III. Intelligence Information for CVE-2025-40907

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Patches & Fixes for CVE-2025-40907 (1)

Proof of Concept for CVE-2025-40907 (1)

News Coverage for CVE-2025-40907 (1)

IV. Related Vulnerabilities

Same product: FCGI
Same vendor: ETHER
Same weakness: CWE-1395

V. Comments for CVE-2025-40907

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