CVE-2025-41765Network attack vector

Unauthenticated arbitrary uploads via unchecked role

Published Mar 9, 2026 · Updated Mar 9, 2026

Missing authorization in MBS Universal BACnet Router firmware before 6.0.1.0 allows remote attackers to upload arbitrary data. The wwwupload.cgi endpoint checks only whether a session exists and does not verify the associated role before accepting contact images, certificates, backups, peer configurations, or keys. The CNA treats the endpoint as remotely reachable without privileges, while the vendor advisory describes guest-session access; applied uploads can alter device configuration or interrupt service.

CVSS severity9.1
Critical
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in MBS Universal BACnet Router firmware before 6.0.1.0 allows remote attackers to upload arbitrary data. The wwwupload.cgi endpoint checks only whether a session exists and does not verify the associated role before accepting contact images, certificates, backups, peer configurations, or keys. The CNA treats the endpoint as remotely reachable without privileges, while the vendor advisory describes guest-session access; applied uploads can alter device configuration or interrupt service.

The record

CVE
CVE-2025-41765
Published
Mar 9, 2026
Updated
Mar 9, 2026
Vendor
MBS GmbH
Product
UBR | LON
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.0 <6.0.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MBS GmbH · UBR | LONversion=0.0.0 <6.0.1.0
MBS GmbH · UBR-01 | Mk IIversion=0.0.0 <6.0.1.0
MBS GmbH · UBR-02version=0.0.0 <6.0.1.0

Published CVSS scores

9.1CERT VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

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

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Your stack

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