CVE-2025-66263

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

CVE-2025-66263 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

CVE-2025-66263 affects products from dbbroadcast, specifically: mozart_dds_next_100, mozart_dds_next_1000, mozart_dds_next_1000_firmware, mozart_dds_next_100_firmware, mozart_dds_next_2000, mozart_dds_next_2000_firmware, mozart_dds_next_30, mozart_dds_next_300, mozart_dds_next_3000, mozart_dds_next_3000_firmware, mozart_dds_next_300_firmware, mozart_dds_next_30_firmware, mozart_dds_next_3500, mozart_dds_next_3500_firmware, mozart_dds_next_50, mozart_dds_next_500, mozart_dds_next_500_firmware, mozart_dds_next_50_firmware, mozart_dds_next_6000, mozart_dds_next_6000_firmware, mozart_dds_next_7000, mozart_dds_next_7000_firmware, mozart_next_100, mozart_next_1000, mozart_next_1000_firmware, mozart_next_100_firmware, mozart_next_2000, mozart_next_2000_firmware, mozart_next_30, mozart_next_300, mozart_next_3000, mozart_next_3000_firmware, mozart_next_300_firmware, mozart_next_30_firmware, mozart_next_3500, mozart_next_3500_firmware, mozart_next_50, mozart_next_500, mozart_next_500_firmware, mozart_next_50_firmware, mozart_next_6000, mozart_next_6000_firmware, mozart_next_7000, mozart_next_7000_firmware. Check the affected products table above for specific version ranges.

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.