Arbitrary Write with ubr-editfile
Priority LOW 35CWE-1242Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
A low-privileged remote attacker can exploit the ubr-editfile method in wwwubr.cgi, an undocumented and unused API endpoint to write arbitrary files on the system.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00367 30th 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
- Partial
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-2025-41756
- 2026-10-03 Alias added: GHSA-3v8q-rhw6-pvm8
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-2025-41756 · CVE Program
- CVE-2025-41756 · NVD
- FIRST EPSS
- GHSA-3v8q-rhw6-pvm8 · 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