# CVE-2025-66255: Unauthenticated Arbitrary File Upload (upgrade_contents.php)

> Unauthenticated attackers can upload malicious firmware to FM transmitters via an unvalidated endpoint, leading to remote code execution.

- **Severity:** Critical 9.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Nov 2025
- **Updated:** 3 Dec 2025
- **Also known as:** GHSA-22cp-hq23-fv85

## What is CVE-2025-66255?

CVE-2025-66255 is a critical vulnerability in DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter, published on 26 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Unauthenticated Arbitrary File Upload (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 Missing signature validation allows uploading malicious firmware packages. 
The firmware upgrade endpoint in `upgrade_contents.php` accepts arbitrary file uploads without validating file headers, cryptographic signatures, or enforcing .tgz format requirements, allowing malicious firmware injection. This endpoint also subsequently provides ways for arbitrary file uploads and subsequent remote code execution

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2025-66255?

It affects 22 products.


Products: Dbbroadcast Mozart Dds Next 1000 Firmware, Dbbroadcast Mozart Dds Next 100 Firmware, Dbbroadcast Mozart Dds Next 2000 Firmware, Dbbroadcast Mozart Dds Next 3000 Firmware, Dbbroadcast Mozart Dds Next 300 Firmware, Dbbroadcast Mozart Dds Next 30 Firmware, Dbbroadcast Mozart Dds Next 3500 Firmware, Dbbroadcast Mozart Dds Next 500 Firmware, Dbbroadcast Mozart Dds Next 50 Firmware, Dbbroadcast Mozart Dds Next 6000 Firmware, Dbbroadcast Mozart Dds Next 7000 Firmware, Dbbroadcast Mozart Next 1000 Firmware, Dbbroadcast Mozart Next 100 Firmware, Dbbroadcast Mozart Next 2000 Firmware, Dbbroadcast Mozart Next 3000 Firmware, Dbbroadcast Mozart Next 300 Firmware, Dbbroadcast Mozart Next 30 Firmware, Dbbroadcast Mozart Next 3500 Firmware, Dbbroadcast Mozart Next 500 Firmware, Dbbroadcast Mozart Next 50 Firmware and 2 more.

## How do I fix CVE-2025-66255?

No fix has been published for CVE-2025-66255 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-66255 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66255 exists.

## Other vulnerabilities in DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter

- [CVE-2025-66253](https://insights.sbomify.com/CVE-2025-66253/): Unauthenticated OS Command Injection (start_upgrade.php) (critical 9.9)
- [CVE-2025-66256](https://insights.sbomify.com/CVE-2025-66256/): Unauthenticated Arbitrary File Upload (patch_contents.php) (critical 9.9)
- [CVE-2025-66261](https://insights.sbomify.com/CVE-2025-66261/): Unauthenticated OS Command Injection (restore_settings.php) (critical 9.9)
- [CVE-2025-63228](https://insights.sbomify.com/CVE-2025-63228/): File upload in n/a (critical 9.8)
- [CVE-2025-66259](https://insights.sbomify.com/CVE-2025-66259/): Authenticated Root Remote Code Execution through improper filtering of HTTP post request parameters (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66255 and fix it if it is affected.

What it is: CVE-2025-66255 is a critical vulnerability in DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter, published on 26 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66255 exists.

Affected product: DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-66255/ (Markdown: https://insights.sbomify.com/CVE-2025-66255/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66255
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66255
- OSV: https://osv.dev/vulnerability/CVE-2025-66255

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66255/
Summaries are generated and may contain mistakes; the official description above is the record.