CVE-2025-41767
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 · uneditedA high-privileged remote attacker can fully compromise the device by abusing an update signature bypass vulnerability in the wwwupdate.cgi method in the web interface of UBR.
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 confidenceA high-privileged remote attacker can fully compromise the device by abusing an update signature bypass vulnerability in the wwwupdate.cgi method in the web interface of UBR. The flaw allows unauthenticated or improperly authenticated firmware updates to be installed by bypassing cryptographic signature verification.
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< 6.0.1.0CVSS 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Identify the Universal Bacnet Router deviceLocate the Mbs Solutions Universal Bacnet Router in your network inventory or physically identify the deviceAffected if The device is an Mbs Solutions Universal Bacnet Router
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Check the installed firmware versionAccess the device admin interface or use SNMP/CLI to query the current firmware version, then compare it to the affected range of versions prior to 6.0.1.0Affected if The installed firmware version is lower than 6.0.1.0
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Verify if the web interface is accessibleConfirm whether the device web management interface (wwwupdate.cgi endpoint) is reachable from the networkAffected if The web interface is exposed and accessible
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Check web interface authentication configurationReview the device security settings to determine if authentication is properly enforced for firmware update operations via wwwupdate.cgiAffected if Authentication is disabled or improperly configured for the update mechanism
The environment is affected if an Mbs Solutions Universal Bacnet Router is running firmware version lower than 6.0.1.0 and has its web interface accessible, allowing potential exploitation of the signature bypass in the wwwupdate.cgi update mechanism.
Generated from the published advisory. Verify against your own configuration.
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 · scoped6.0.1.0
Apply vendor-provided patches or firmware updates addressing the signature bypass vulnerability; restrict administrative web interface access to trusted, authorized users and monitor for anomalous update activity.
Universal Bacnet Router Firmware 6.0.1.0
- 1. Access the UBR device web interface and navigate to the firmware update section.
- 2. Identify the current firmware version to confirm it is below 6.0.1.0.
- 3. Obtain the firmware version 6.0.1.0 or later from the official vendor source (www.mbs-solutions.de).
- 4. Create a backup of the current device configuration before proceeding with the update.
- 5. Upload the firmware file (6.0.1.0 or later) using the wwwupdate.cgi method in the web interface.
- 6. Wait for the firmware upload and installation process to complete.
- 7. Verify that the device has successfully updated to version 6.0.1.0 or later.
- 8. Confirm the signature verification vulnerability is remediated by attempting a test update with a tampered firmware file (if in a lab environment).
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-41767 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-41767 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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