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Universal Bacnet Router FirmwareOperating system · Mbs Solutions

CVE-2025-41763

MEDIUM · 6.5 CVSS v3.1 Published 2026-03-09
Fix available
A fix is available. Upgrade to 6.0.1.0 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A low‑privileged remote attacker can directly interact with the wwwdnload.cgi endpoint to download any resource available to administrators, including system backups and certificate request files.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The wwwdnload.cgi endpoint lacks proper authorization checks, allowing any authenticated user (including low-privileged ones) to download files that should only be accessible to administrators, such as system backups and certificate request files. This is a broken access control vulnerability where the endpoint directly exposes sensitive resources without verifying user privileges.

MitigationImplement and enforce role-based access control on the wwwdnload.cgi endpoint to verify user privileges before allowing any file download, restricting access to administrator-level resources only.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Universal Bacnet Router FirmwareOperating system
Affected:< 6.0.1.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the installed firmware version
    Access the router's web interface or check the system information page, or use SNMP/CLI commands to retrieve the firmware version (e.g., 'show version' or similar).
    Affected if The firmware version is below 6.0.1.0 (e.g., 6.0.0.x, 5.x.x, etc.)
  2. Confirm wwwdnload.cgi endpoint exists
    Attempt to access the URL path /wwwdnload.cgi on the router's web server (e.g., https://<router-ip>/wwwdnload.cgi). Check if the endpoint responds or is present in the web server's allowed CGI paths.
    Affected if The endpoint returns a valid response (200 OK) rather than a 404 or access denied error, indicating it is enabled and accessible.
  3. Test access control with a low-privileged account
    Log in to the web interface with a non-administrator (low-privileged) user account and attempt to access the wwwdnload.cgi endpoint directly, or try to request known sensitive file paths such as system backups or certificate request files through this endpoint.
    Affected if The low-privileged user can successfully retrieve files that should only be available to administrators (e.g., backup files, certificate request files).
  4. Review user role permissions configuration
    Check the router's access control settings or user role configuration files (if accessible via CLI or backup) to verify whether the wwwdnload.cgi endpoint is restricted to administrator-level roles only.
    Affected if The configuration shows no role-based restriction on wwwdnload.cgi, or the endpoint is mapped to a role accessible by low-privileged users.

You are affected if the firmware version is below 6.0.1.0 AND the wwwdnload.cgi endpoint is accessible to authenticated users with non-administrator privileges.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.0.1.0 or later
Fixed in 6.0.1.0
Interim mitigation

Implement and enforce role-based access control on the wwwdnload.cgi endpoint to verify user privileges before allowing any file download, restricting access to administrator-level resources only.

Recommended fix High confidence

6.0.1.0

  1. Obtain the fixed firmware version 6.0.1.0 or later from the vendor (www.mbs-solutions.de)
  2. Access the Universal Bacnet Router administrative interface
  3. Navigate to the firmware update or system maintenance section
  4. Upload and apply the firmware version 6.0.1.0 or later following the vendor's documented update procedure
  5. Verify the firmware version has been updated successfully
  6. Confirm the wwwdnload.cgi endpoint no longer allows unauthorized access

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Universal Bacnet Router Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-41763 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data