Unauthorized network access via empty pass filter
Published Mar 9, 2026 · Updated Mar 9, 2026
Fail-open filtering in MBS GmbH UBR firmware before 6.0.1.0 allows remote attackers to reach otherwise blocked BACnet networks. The pass-filter logic treats an empty allowlist as no filter instead of a deny-all rule, so every network connection continues to pass. Exposure requires an administrator to configure an empty pass table; the bypass permits unauthorized network access without altering router data or interrupting service.
Summary
What happened
Fail-open filtering in MBS GmbH UBR firmware before 6.0.1.0 allows remote attackers to reach otherwise blocked BACnet networks. The pass-filter logic treats an empty allowlist as no filter instead of a deny-all rule, so every network connection continues to pass. Exposure requires an administrator to configure an empty pass table; the bypass permits unauthorized network access without altering router data or interrupting service.
The record
- CVE
- CVE-2025-41760
- Published
- Mar 9, 2026
- Updated
- Mar 9, 2026
- Vendor
- MBS GmbH
- Product
- UBR | LON
- Classifications
- CWE-636, CWE-1059
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Mar 9, 2026CVE publishedPublication date reported by the CVE source.
- Mar 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.0 <6.0.1.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo