What is the CVSS score of CVE-2025-41756?

CVE-2025-41756 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-41756?

Within 24 hours: Identify all systems running wwwubr.cgi and isolate internet-facing instances from production networks; document asset inventory and exposure. Within 7 days: Implement network-level blocking of the ubr-editfile method via WAF/IDS rules and disable wwwubr.cgi if operationally feasible; deploy enhanced logging to detect exploitation attempts. Within 30 days: Develop and test a remediation plan including vendor patching once available, or evaluate alternative solutions if the vendor does not provide a patch.

Universal Bacnet Router Firmware CVE-2025-41756

HIGH

Inclusion of Undocumented Features or Chicken Bits (CWE-1242)

2026-03-09 info@cert.vde.com

Information Disclosure Universal Bacnet Router Firmware Mbs Solutions

8.1

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-1242 OWASP Top 10:2025 A04:2025 - Cryptographic Failures ASVS 5.0 V11 - Cryptography Cryptographic implementation review
Impact	CVSS 8.1 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

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. [CVSS 8.1 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Affects Universal Bacnet Router Firmware. 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.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.1 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

A critical vulnerability in an undocumented API endpoint (wwwubr.cgi) allows remote attackers to write arbitrary files to affected systems, potentially leading to complete system compromise, data theft, or service disruption. Any internet-exposed system running vulnerable software is at immediate risk of exploitation, even with low attack complexity.

Business Impact: High

Compensating Controls

Disable wwwubr.cgi endpoint if not actively used; implement Web Application Firewall rules to block POST/PUT requests to ubr-editfile method; restrict network access to wwwubr.cgi via firewall rules allowing only trusted sources; enable detailed logging and monitoring of all requests to the endpoint; implement file integrity monitoring (FIM) to detect unauthorized file writes; consider segmenting affected systems from critical infrastructure until patch availability is confirmed.

Threat Intelligence Overview

EPSS Score

0.1%

Top 73% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +40

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.