What is CVE-2024-40125?

CVE-2024-40125 is a critical-severity vulnerability in Closed-Loop Cless Server, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2024-09-19.

How severe is CVE-2024-40125?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Closed-Loop Cless Server

CVE-2024-40125

An arbitrary file upload vulnerability in the Media Manager function of Closed-Loop Technology CLESS Server v4.5.2 allows attackers to execute arbitrary code via uploading a crafted PHP file to the upload endpoint.

Vulnerability class: Unrestricted File Upload

Published 2024-09-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.8th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Closed-Loop Cless Server — versions 4.5.2

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

www.closed-loop.biz/ (Product)
github.com/brendontkl/My-CVEs/tree/main/CVE-2024-40125 (Exploit)

Frequently asked questions

What is CVE-2024-40125?: CVE-2024-40125 is a critical-severity vulnerability in Closed-Loop Cless Server, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2024-09-19.
How severe is CVE-2024-40125?: Critical severity. CVSS v3 base score is 9.8 out of 10.