How severe is CVE-2025-66256?

CVE-2025-66256 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-66256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66256?

CVE-2025-66256 primarily affects Dbbroadcast Mozart Next 100 Firmware. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-66256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-66256 have an EU (EUVD) identifier?

Yes. CVE-2025-66256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199676.

When was CVE-2025-66256 published?

CVE-2025-66256 was published on 2025-11-26 and last updated on 2026-06-17.

CVE-2025-66256

CVE-2025-66256 is a critical-severity vulnerability in Dbbroadcast Mozart Next 100 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.9
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199676
Weakness: CWE-434
Affected product: Dbbroadcast Mozart Next 100 Firmware
Published: 2025-11-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-66256?: 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.
How severe is CVE-2025-66256?: CVE-2025-66256 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-66256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66256?: CVE-2025-66256 primarily affects Dbbroadcast Mozart Next 100 Firmware. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-66256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-66256 have an EU (EUVD) identifier?: Yes. CVE-2025-66256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199676.
When was CVE-2025-66256 published?: CVE-2025-66256 was published on 2025-11-26 and last updated on 2026-06-17.

References

https://www.abdulmhsblog.com/posts/webfmvulns/

Affected products (22)

cpe:2.3:o:dbbroadcast:mozart_next_100_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_1000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_2000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_30_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_300_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_3000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_3500_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_50_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_500_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_6000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_next_7000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_30_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_50_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_100_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_300_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_500_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_1000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_2000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_3000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_3500_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_6000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dbbroadcast:mozart_dds_next_7000_firmware:-:*:*:*:*:*:*:*

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CVE-2025-66259 — Critical (CVSS 9.8): Authenticated Root Remote Code Execution via improrer user input filtering in DB Electronica Telecomunicazioni S.p.A.…
CVE-2025-66255 — Critical (CVSS 9.8): Unauthenticated Arbitrary File Upload (upgrade_contents.php) in DB Electronica Telecomunicazioni S.p.A. Mozart FM…
CVE-2025-66253 — Critical (CVSS 9.8): Unauthenticated OS Command Injection (start_upgrade.php) in DB Electronica Telecomunicazioni S.p.A. Mozart FM…
CVE-2025-66250 — Critical (CVSS 9.8): Unauthenticated Arbitrary File Upload (status_contents.php) in DB Electronica Telecomunicazioni S.p.A. Mozart FM…

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