Vulnerability · Published Nov 26, 2025 · Assigned by Gridware

CVE-2025-66255Unauthenticated Arbitrary File Upload (upgrade_contents.php)

Critical 9.9

In plain English

A critical-severity insufficient verification of data authenticity in Mozart FM Transmitter from DB Electronica Telecomunicazioni S.p.A.. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 4.0)9.9Critical

Exploit odds (30 days)0.4%top 64.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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

Affected products (as reported)

Vendor	Product	Versions
DB Electronica Telecomunicazioni S.p.A.	Mozart FM Transmitter	3050100300500100020003000

Weakness: CWE-345 · Vector: 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

References

https://www.abdulmhsblog.com/posts/webfmvulns/ exploit, technical-description