UBR-01 Mk II: Improper Verification of Cryptographic Signature
CVE-2025-41767 is a high-severity improper verification of cryptographic signature vulnerability in UBR-01 Mk II from MBS, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. The record lists version 6.0.1.0 as the first without the flaw, so updating UBR-01 Mk II to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.25% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update UBR-01 Mk II to 6.0.1.0 or a later version.
- Update UBR-02 to 6.0.1.0 or a later version.
- Update UBR-LON to 6.0.1.0 or a later version.
- Read the advisory on mbs-solutions.de for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| MBS | UBR-01 Mk II | before 6.0.1.0 | 6.0.1.0 |
| MBS | UBR-02 | before 6.0.1.0 | 6.0.1.0 |
| MBS | UBR-LON | before 6.0.1.0 | 6.0.1.0 |
| Mbs-solutions | Universal Bacnet Router Firmware | before 6.0.1.0 | 6.0.1.0 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- HighAdministrator-level access is required first.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (cert.vde.com).
Official description
A 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in UBR-01 Mk II
- 7.5 High severity
- 8.8 High severity
- 9.1 Critical severity
- 9.1 Critical severity
- 7.8 High severity
- 8.8 High severity
Recent Improper Verification of Cryptographic Signature vulnerabilities
- 9.8 Critical severity
- 9.1 Critical severity
- 7.5 High severity
- 7.5 High severity
- 8.8 High severity
- 8.1 High severity
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