Mozart FM Transmitter: External Control of File Name or Path
CVE-2025-66254 is a critical-severity external control of file name or path vulnerability in Mozart FM Transmitter from DB Electronica Telecomunicazioni S.p.A., with a CVSS 3.1 base score of 9.1 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 0.41% 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
- NoneNo data is disclosed.
- 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:N/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 7.8 | High | CNA |
| CVSS 3.1 | 9.1 | Critical | NVD |
Official description
Unauthenticated Arbitrary File Deletion (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 The deleteupgrade parameter allows unauthenticated deletion of arbitrary files. The `deleteupgrade` parameter in `/var/www/upgrade_contents.php` allows unauthenticated deletion of arbitrary files in `/var/www/upload/` without any extension restriction or path sanitization, enabling attackers to remove critical system files.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: External Control of File Name or Path
The product allows user input to control or influence paths or file names that are used in filesystem operations.
How developers prevent this class of flaw
- When the set of filenames is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames, and reject all other inputs. For example, ID 1 could map to inbox.txt and ID 2 could map to profile.txt. Features such as the ESAPI AccessReferenceMap provide this capability.
- Run your code in a jail or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict all access to files within a particular directory. Examples include the Unix chroot jail and AppArmor. In general, managed code may provide some protection. This may not be a feasible solution, and it only limits the impact to the operating system; the rest of your application may still be subject to compromise. Be careful to avoid CWE-243 and other weaknesses related to jails.
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
More External Control of File Name or Path vulnerabilities (CWE-73)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: partial).
- 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 External Control of File Name or Path vulnerabilities
- 9.1 Critical severity
- 8.1 High severity
- 7.5 High severity
- 7.5 High severity
- 9.3 Critical severity
- 8.2 High severity
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