CVE-2025-66255

Name: CVE-2025-66255
Creator: NVD / NIST
Published: 2025-11-26T01:16:08.71+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2025-66255 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. Unauthenticated Arbitrary File Upload (upgrade_contents.php) in DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter versions 30, 50, 100, 300, 500, 1000, 2000, 3000, 3500, 6000, 7000 allows an attacker to perform Missing signature validation allows uploading malicious firmware packages. The firmware upgrade endpoint in `upgrade_contents.php` accepts arbitrary file uploads without validating file headers, cryptographic signatures, or enforcing .tgz format requirements, allowing malicious firmware injection. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

Unauthenticated Arbitrary File Upload (upgrade_contents.php) in DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter versions 30, 50, 100, 300, 500, 1000, 2000, 3000, 3500, 6000, 7000 allows an attacker to perform Missing signature validation allows uploading malicious firmware packages. The firmware upgrade endpoint in `upgrade_contents.php` accepts arbitrary file uploads without validating file headers, cryptographic signatures, or enforcing .tgz format requirements, allowing malicious firmware injection. This endpoint also subsequently provides ways for arbitrary file uploads and subsequent remote code execution

Metrics

CVSS 3.1

9.8/10

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

CVSS 4.0

9.9/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.33%

24.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Dbbroadcast	Mozart Next 3000 Firmware	All versions
Dbbroadcast	Mozart Next 3500 Firmware	All versions
Dbbroadcast	Mozart Next 50 Firmware	All versions
Dbbroadcast	Mozart Next 500 Firmware	All versions
Dbbroadcast	Mozart Next 6000 Firmware	All versions
Dbbroadcast	Mozart Next 7000 Firmware	All versions
Dbbroadcast	Mozart Next 100 Firmware	All versions
Dbbroadcast	Mozart Next 1000 Firmware	All versions
Dbbroadcast	Mozart Next 2000 Firmware	All versions
Dbbroadcast	Mozart Next 30 Firmware	All versions
Dbbroadcast	Mozart Next 300 Firmware	All versions
Dbbroadcast	Mozart Dds Next 30 Firmware	All versions
Dbbroadcast	Mozart Dds Next 50 Firmware	All versions
Dbbroadcast	Mozart Dds Next 100 Firmware	All versions
Dbbroadcast	Mozart Dds Next 300 Firmware	All versions
Dbbroadcast	Mozart Dds Next 500 Firmware	All versions
Dbbroadcast	Mozart Dds Next 1000 Firmware	All versions
Dbbroadcast	Mozart Dds Next 2000 Firmware	All versions
Dbbroadcast	Mozart Dds Next 3000 Firmware	All versions
Dbbroadcast	Mozart Dds Next 3500 Firmware	All versions
Dbbroadcast	Mozart Dds Next 6000 Firmware	All versions
Dbbroadcast	Mozart Dds Next 7000 Firmware	All versions

References

https://www.abdulmhsblog.com/posts/webfmvulns/Exploit, Third Party Advisory
https://www.abdulmhsblog.com/posts/webfmvulns/Exploit, Third Party Advisory

Timeline

Published: Nov 26, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66255?

How severe is CVE-2025-66255?

CVE-2025-66255 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66255?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-66255?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST