Vulnerability · Published Nov 26, 2025 · Assigned by Gridware
CVE-2025-66263Unauthenticated Arbitrary File Read via Null Byte Injection
High 8.9
In plain English
A high-severity security flaw in Mozart FM Transmitter from DB Electronica Telecomunicazioni S.p.A.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Official description
Unauthenticated Arbitrary File Read via Null Byte Injection 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 Null byte injection in download_setting.php allows reading arbitrary files. The `/var/tdf/download_setting.php` endpoint constructs file paths by concatenating user-controlled `$_GET['filename']` with a forced `.tgz` extension. Running on PHP 5.3.2 (pre-5.3.4), the application is vulnerable to null byte injection (%00), allowing attackers to bypass the extension restriction and traverse paths. By requesting `filename=../../../../etc/passwd%00`, the underlying C functions treat the null byte as a string terminator, ignoring the appended `.tgz` and enabling unauthenticated arbitrary file disclosure of any file readable by the web server user.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| DB Electronica Telecomunicazioni S.p.A. | Mozart FM Transmitter | 3050100300500100020003000 |
Weakness: CWE-158 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
References
- https://www.abdulmhsblog.com/posts/webfmvulns/ exploit, technical-description