CVE-2025-66253
CWE-78Published: November 26, 2025· Updated: Jun 17, 2026
Official Description
Unauthenticated OS Command Injection (start_upgrade.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 User input passed directly to exec() allows remote code execution via start_upgrade.php. The `/var/tdf/start_upgrade.php` endpoint passes user-controlled `$_GET["filename"]` directly into `exec()` without sanitization or shell escaping. Attackers can inject arbitrary shell commands using metacharacters (`;`, `|`, etc.) to achieve remote code execution as the web server user (likely root).
Risk Analysis
DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitters are susceptible to unauthenticated OS command injection through the 'start_upgrade.php' endpoint. This critical vulnerability, with a CVSS score of 9.8, allows an unauthenticated attacker to inject arbitrary shell commands, leading to remote code execution as the web server user, likely root. The flaw is remotely exploitable.
No public exploit is known for this vulnerability. The flaw is remotely exploitable due to its network attack vector and low attack complexity.
Implement robust input validation and sanitization for all user-controlled parameters passed to system commands. Avoid direct execution of user input in 'exec()' functions.
Technical Analysis
CVE-2025-66253 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (2)
Quick Facts
Related CVEs (CWE-78)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-66253 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts