CVE-2025-66254 is a critical (CVSS 9.1) unauthenticated arbitrary file deletion in the Mozart FM Transmitter web interface. The deleteupgrade parameter in upgrade_contents.php deletes files in the upload directory with no extension limit or path checks. The record names no fix, so isolate the interface and contact the vendor.
What's affected
- Product: Mozart FM Transmitter from DB Electronica Telecomunicazioni S.p.A. (DB Broadcast), web management interface. The record lists models 30, 50, 100, 300, 500, 1000, 2000, 3000, 3500, 6000 and 7000.
- Component: upgrade_contents.php and its deleteupgrade parameter, which acts on files in /var/www/upload/.
- Fixed: neither the record nor the researcher write-up we read names a fixed firmware version or a vendor advisory. Contact the vendor for patch status before assuming one exists.
- Severity: the record scores it 9.1 (critical) with the vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H. The record vector shows high integrity and availability impact and no confidentiality impact.
How to check if you're exposed
This is a broadcast appliance, so there is no package manager to query. Work from the device and the network.
- Build a list of every Mozart unit you run, with its model and the web interface version string. The researcher write-up refers to the web management interface version WEBMOZZI-00287.
- Find out whether the management web interface of each unit is reachable from the internet, from a partner network or from a flat internal network. Check firewall rules and any remote access gateway.
- Look at the web server logs on a device you can inspect, or at the logs of any proxy in front of it, for requests to the PHP file named in this CVE from addresses you do not recognize.
If the interface is reachable by people outside the small group that needs it, treat the device as exposed.
What to do now
- Take the management interface off the internet and off any shared network. Put it behind a VPN or a jump host, with an allow list of administrator addresses.
- Ask DB Broadcast for the patch status of this CVE and for a firmware version that fixes it. Record the answer with your asset notes.
- Verify the contents of the upload and upgrade directories on any device you can inspect, and compare them with what you expect.
- Watch the device for unexpected files, new accounts, changed settings or reboots, and keep a known good copy of its configuration to compare against.
- Add the rest of your internet facing software to an inventory. Safeguard cannot patch a transmitter, but a free in-browser scan at gold.safeguard.sh/scan and a proper asset inventory help you find the other internet facing software you run, and reachability analysis helps you rank what to fix first.
Why it matters
The weakness is CWE-73, external control of a file name or path. The record says the parameter deletes files in the upload directory without any extension restriction or path sanitization, so the caller picks the target.
It pairs with the upgrade upload flaws in the same file. A device whose upload folder can be emptied or filled by anyone on the network has no trustworthy update path. Defenders should assume that if a page lets an unauthenticated user change files, the attacker will use that for more than deletion. The record does not mark this as exploited in the wild and it is not on the CISA KEV list. The advisory trail is thin, since the main public source is a researcher write-up rather than a vendor bulletin, so confirm facts with the vendor. Appliances of this kind sit for years without updates, which is why network isolation is the control you can apply today.
Quick check
Where does the deletion happen?
In the upload directory, according to the record, through the deleteupgrade parameter.
Does the extension matter?
No. The record says there is no extension restriction.
Sources
- Researcher write-up: 14 vulnerabilities in the Mozart FM Transmitter web interface
- Safeguard Gold entry
Last reviewed: 18 October 2026.
