MBS UBR-01 Mk II/UBR-02/UBR-LON prior 6.0.1.0 API Endpoint wwwubr.cgi inclusion of undocumented features or chicken bits

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability was found in MBS UBR-01 Mk II, UBR-02 and UBR-LON. It has been classified as problematic. This impacts an unknown function of the file wwwubr.cgi of the component API Endpoint. Performing a manipulation results in inclusion of undocumented features or chicken bits. This vulnerability is cataloged as CVE-2025-41756. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in MBS UBR-01 Mk II, UBR-02 and UBR-LON. It has been classified as problematic. This affects an unknown code block of the file wwwubr.cgi of the component API Endpoint. The manipulation with an unknown input leads to a inclusion of undocumented features or chicken bits vulnerability. CWE is classifying the issue as CWE-1242. The device includes chicken bits or undocumented features that can create entry points for unauthorized actors. This is going to have an impact on integrity, and availability. The summary by CVE is:

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.

The weakness was shared by Adrien Rey as mbs-2025-0001. The advisory is shared at mbs-solutions.de. This vulnerability is uniquely identified as CVE-2025-41756 since 04/16/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available.

Upgrading to version 6.0.1.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-208359). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.4
VulDB Temp Score: 5.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (CERTVDE): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Inclusion of undocumented features or chicken bits
CWE: CWE-1242 / CWE-912
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: UBR-01 Mk II/UBR-02/UBR-LON 6.0.1.0

Timelineinfo

04/16/2025 CVE reserved
03/09/2026 +327 days Advisory disclosed
03/09/2026 +0 days VulDB entry created
03/12/2026 +3 days VulDB entry last update

Sourcesinfo

Advisory: mbs-2025-0001
Researcher: Adrien Rey
Status: Confirmed

CVE: CVE-2025-41756 (🔒)
GCVE (CVE): GCVE-0-2025-41756
GCVE (VulDB): GCVE-100-349809
EUVD: 🔒

Entryinfo

Created: 03/09/2026 12:22
Updated: 03/12/2026 20:39
Changes: 03/09/2026 12:22 (65), 03/09/2026 13:35 (1), 03/12/2026 20:39 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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