CVE-2025-41757Network attack vector

Authenticated arbitrary file overwrite via unchecked restore archive

Published Mar 9, 2026 · Updated Mar 9, 2026

Path traversal in MBS UBR firmware before 6.0.1.0 allows remote authenticated users to overwrite arbitrary system files. The elevated ubr-restore process extracts file paths from user-supplied backup archives without validating where they resolve. A low-privileged web account and restore access suffice, enabling modification of scripts, credentials, configuration, and network filters.

CVSS severity8.8
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in MBS UBR firmware before 6.0.1.0 allows remote authenticated users to overwrite arbitrary system files. The elevated ubr-restore process extracts file paths from user-supplied backup archives without validating where they resolve. A low-privileged web account and restore access suffice, enabling modification of scripts, credentials, configuration, and network filters.

The record

CVE
CVE-2025-41757
Published
Mar 9, 2026
Updated
Mar 9, 2026
Vendor
MBS GmbH
Product
UBR | LON
Classifications
CWE-22, CWE-20, T1068
Attack vector
network
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesauthenticated

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

8.8CERT VDECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1MBS GmbHCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

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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