CVE-2025-41664Network attack vector

Privilege escalation via unenforced partition permissions

Published Sep 8, 2025 · Updated Sep 8, 2025

Improper permissions in WAGO fieldbus coupler firmware before FW13 allow remote authenticated users to modify firmware files. The firmware briefly mounts hidden internal partitions containing firmware and certificates, while the Nucleus access layer fails to enforce its supported permissions. A low-privileged FTP or SFTP account and favorable mount timing are required; successful access permits sensitive-file disclosure and firmware modification.

CVSS severity7.5
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper permissions in WAGO fieldbus coupler firmware before FW13 allow remote authenticated users to modify firmware files. The firmware briefly mounts hidden internal partitions containing firmware and certificates, while the Nucleus access layer fails to enforce its supported permissions. A low-privileged FTP or SFTP account and favorable mount timing are required; successful access permits sensitive-file disclosure and firmware modification.

The record

CVE
CVE-2025-41664
Published
Sep 8, 2025
Updated
Sep 8, 2025
Vendor
WAGO
Product
Fieldbus Coupler Modbus TCP M12 (750-364/040-010)
Classifications
CWE-732, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2025Record 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 <FW13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WAGO · Fieldbus Coupler Modbus TCP M12 (750-364/040-010)version=0 <FW13
WAGO · Fieldbus Coupler Modbus TCP (750-362)version=0 <FW13
WAGO · Fieldbus Coupler EtherNet/IP (750-363)version=0 <FW13
WAGO · Fieldbus Coupler Modbus TCP (750-362/040-000)version=0 <FW13
WAGO · Fieldbus Coupler EtherNet/IP (750-363/040-000)version=0 <FW13
WAGO · Fieldbus Coupler EtherNet/IP (750-366)version=0 <FW13
WAGO · Fieldbus Coupler Modbus TCP (750-362/000-001)version=0 <FW13
WAGO · Fieldbus Coupler EtherNet/IP M12 (750-365/040-010)version=0 <FW13

Published CVSS scores

7.5CERT@VDECVSS:3.1/AV:N/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-732Incorrect Permission Assignment for Critical Resource
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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