What is the CVSS score of CVE-2025-40907?

CVE-2025-40907 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L. EPSS exploitation probability: 0.8%.

Which versions of Fcgi are affected by CVE-2025-40907?

CVE-2025-40907 presents moderate security risk, a heap-based buffer overflow vulnerability rated CVSS 5.3. Exploitation could cause memory corruption or application crashes.. A patch is available.

Is there a public PoC exploit available for CVE-2025-40907?

Yes, a public proof-of-concept exploit is available for CVE-2025-40907. Prioritise patching immediately. EPSS: 0.8%.

How to fix or mitigate CVE-2025-40907?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Fcgi CVE-2025-40907

MEDIUM

Heap-based Buffer Overflow (CWE-122)

2025-05-16 9b29abf9-4ab0-4765-b253-1875cd9b441e

Buffer Overflow Heap Overflow Fcgi Red Hat Suse

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SUSE

MEDIUM

qualitative

Red Hat

7.5 HIGH

qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:42 vuln.today

Patch released

Mar 28, 2026 - 18:42 nvd

Patch available

PoC Detected

Sep 29, 2025 - 22:43 vuln.today

Public exploit code

CVE Published

May 16, 2025 - 13:15 nvd

MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified under CWE-122. 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. Affected products include: Fastcgi Fcgi. Version information: through 0.82.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Vendor StatusVendor

SUSE

Severity: Medium

Product	Status
SUSE Liberty Linux 7 LTSS	Fixed
SUSE Liberty Linux 8	Fixed
SUSE Liberty Linux 9	Fixed

CVE-2025-40907 vulnerability details – vuln.today

Back

Fcgi CVE-2025-40907

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

Vendor StatusVendor

SUSE

Share

External POC / Exploit Code