Signature bypass on update upload
Priority LOW 33CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-347.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0025 16th percentileScored 2026-11-07
Fix Fixed UBR-01 Mk II (MBS): 6.0.1.0UBR-02 (MBS): 6.0.1.0+1 more product
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MBS | UBR-01 Mk II | 0.0.0 to before 6.0.1.0 | 6.0.1.0 | Patch available | CNA |
| MBS | UBR-02 | 0.0.0 to before 6.0.1.0 | 6.0.1.0 | Patch available | CNA |
| MBS | UBR-LON | 0.0.0 to before 6.0.1.0 | 6.0.1.0 | Patch available | CNA |
- UBR-01 Mk II VendorMBS Affected 0.0.0 to before 6.0.1.0 Fixed in 6.0.1.0 Patch available CNA
- UBR-02 VendorMBS Affected 0.0.0 to before 6.0.1.0 Fixed in 6.0.1.0 Patch available CNA
- UBR-LON VendorMBS Affected 0.0.0 to before 6.0.1.0 Fixed in 6.0.1.0 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:mbs-solutions:universal_bacnet_router_firmware:*:*:*:*:*:*:*:* | before 6.0.1.0 | Vulnerable | MBS |
| cpe:2.3:h:mbs-solutions:ubr-01_mk_ii:-:*:*:*:*:*:*:* | not specified by NVD | Running on | MBS |
| cpe:2.3:h:mbs-solutions:ubr-02:-:*:*:*:*:*:*:* | not specified by NVD | Running on | MBS |
| cpe:2.3:h:mbs-solutions:ubr-lon:-:*:*:*:*:*:*:* | not specified by NVD | Running on | MBS |
- cpe:2.3:o:mbs-solutions:universal_bacnet_router_firmware:*:*:*:*:*:*:*:* Versions before 6.0.1.0 Vulnerable ·MBS
- cpe:2.3:h:mbs-solutions:ubr-01_mk_ii:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·MBS
- cpe:2.3:h:mbs-solutions:ubr-02:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·MBS
- cpe:2.3:h:mbs-solutions:ubr-lon:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·MBS
Remediation
- Fix · CNA UBR-01 Mk II (MBS) Fixed in 6.0.1.0
- Fix · CNA UBR-02 (MBS) Fixed in 6.0.1.0
- Fix · CNA UBR-LON (MBS) Fixed in 6.0.1.0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
MBS UBR-01 Mk II, UBR-02, UBR-LON 6.0.1.0
15 records Highest priority Priority MEDIUM 5 MEDIUM, 10 LOW
Other records, highest priority first
- TI-2025-27724 Unchecked role in wwwupdate.cgiPriority MEDIUM 46
- TI-2025-27725 Unchecked role in wwwupload.cgiPriority MEDIUM 45
- TI-2025-27726 Stack buffer overflow on parsing web requestPriority MEDIUM 41
Timeline
- 2026-10-02 Threatist record created from CVE-2025-41767
- 2026-10-03 Alias added: GHSA-6hp4-rq8j-6v6j
References
More MBS Universal Bacnet Router Firmware vulnerabilities
- TI-2025-27724 Unchecked role in wwwupdate.cgi CVSS 3.1CRITICAL 9.1
- TI-2025-27725 Unchecked role in wwwupload.cgi CVSS 3.1CRITICAL 9.1
- TI-2025-27726 Stack buffer overflow on parsing web request CVSS 3.1HIGH 8.8
- TI-2025-27718 Arbitrary Write with wwwupload.cgi CVSS 3.1HIGH 8.8
- TI-2025-27717 Arbitrary Write with ubr-restore CVSS 3.1HIGH 8.8
- TI-2025-27732 wwwupdate.cgi Session token in URL CVSS 3.1HIGH 7.5
Sources
- CVE-2025-41767 · CVE Program
- CVE-2025-41767 · NVD
- FIRST EPSS
- GHSA-6hp4-rq8j-6v6j · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences