CVE-2025-66255

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2025-11-26. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
29.6%
KEV
Not listed

Published

November 26, 2025

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Jul 6, 2026
No patch confirmed yet.
generic

14 Vulnerabilities in broadcasting system used by The United Nations, BBC Radio and others | Abduls Blog

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

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-24 14:17 UTCEPSS rescore
  2. 2026-07-24 14:17 UTCEPSS rescore
  3. 2026-07-23 14:18 UTCEPSS rescore
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  5. 2026-07-23 03:01 UTCEG score recompute
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  1. 2026-07-06 16:27 UTCEPSS rescore
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  18. 2026-06-27 03:08 UTCEPSS rescore
  19. 2026-06-25 13:49 UTCEPSS rescore
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  22. 2026-06-23 21:32 UTCEPSS rescore
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  37. 2026-06-14 23:18 UTCEPSS rescore
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  44. 2026-06-10 13:22 UTCEPSS rescore
  45. 2026-06-08 14:17 UTCEPSS rescore
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  47. 2026-06-07 15:24 UTCEPSS rescore
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  65. 2026-05-29 18:50 UTCEG score recompute
  66. 2026-05-29 18:50 UTCGHSA enrichment
  67. 2026-05-29 13:44 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-66255?
CVE-2025-66255 is a critical vulnerability published on November 26, 2025. 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.…
When was CVE-2025-66255 disclosed?
CVE-2025-66255 was first published in the National Vulnerability Database on November 26, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-66255 actively exploited?
CVE-2025-66255 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-66255?
CVE-2025-66255 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-66255?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66255, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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