Mozart FM Transmitter: Unrestricted Upload of File with Dangerous Type
CVE-2025-66256 is a critical-severity unrestricted upload of file with dangerous type vulnerability in Mozart FM Transmitter from DB Electronica Telecomunicazioni S.p.A., with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Mozart FM Transmitter versions: 30; 50; 100, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.47% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of Mozart FM Transmitter you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| DB Electronica Telecomunicazioni S.p.A. | Mozart FM Transmitter | 30; 50; 100; 300; 500; 1000; 2000; 3000; and 3 more ranges | Not stated |
| Dbbroadcast | Mozart Next 100 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 1000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 2000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 30 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 300 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 3000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 3500 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 50 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 500 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 6000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Next 7000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 30 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 50 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 100 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 300 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 500 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 1000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 2000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 3000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 3500 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 6000 Firmware | Not specified in the record | Not stated |
| Dbbroadcast | Mozart Dds Next 7000 Firmware | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 9.9 | Critical | CNA |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
Unauthenticated Arbitrary File Upload (patch_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 Unrestricted file upload in patch_contents.php allows uploading malicious files. The `/var/tdf/patch_contents.php` endpoint allows unauthenticated arbitrary file uploads without file type validation, MIME checking, or size restrictions beyond 16MB, enabling attackers to upload malicious files.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
How developers prevent this class of flaw
- Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
More Unrestricted Upload of File with Dangerous Type vulnerabilities (CWE-434)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Technical write-ups (may include proof of concept)
- abdulmhsblog.com/posts/webfmvulns/Exploit, Third Party Advisory
Other vulnerabilities in Mozart FM Transmitter
- 7.5 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.1 Critical severity
- 9.8 Critical severity
Recent Unrestricted Upload of File with Dangerous Type vulnerabilities
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.2 High severity
- 9.3 Critical severity
- 7.2 High severity
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