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Schneider Electric Modicon M340 Controller and Communication Modules (Update A)

HIGH
CVSS 7.5
Date 2026-06-04T06:00:00+00:00
Source cisa-csaf
Published by CISA

// Description

We strongly recommend the following industry cybersecurity best practices. * Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network. * Install physical controls so no unauthorized personnel can access your industrial control and safety systems, components, peripheral equipment, and networks. * Place all controllers in locked cabinets and never leave them in the “Program” mode. * Never connect programming software to any network other than the network intended for that device. * Scan all methods of mobile data exchange with the isolated network such as CDs, USB drives, etc. before use in the terminals or any node connected to these networks. * Never allow mobile devices that have connected to any other network besides the intended network to connect to the safety or control networks without proper sanitation. * Minimize network exposure for all control system devices and systems and ensure that they are not accessible from the Internet. * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current version available. Also, understand that VPNs are only as secure as the connected devices. For more information refer to the Schneider Electric [Recommended Cybersecurity Best Practices](https://www.se.com/us/en/download/document/7EN52-0390/) document.

// Vulnerabilities (1)

CVE ID CVSS Score Severity Description
CVE-2025-6625 7.5 high
CVE-2025-6625. CWE-20: Improper Input Validation vulnerability exists that could cause a Denial Of Service when specific crafted FTP command is sent to the device.

// Affected Products (5)

Vendor Product Asset Type Purdue Level Firmware
Schneider Electric Unknown rtu
L1
--
Schneider Electric Unknown plc
L1
--
Schneider Electric Unknown plc
L1
--
Schneider Electric Unknown plc
L1
--
Schneider Electric Unknown plc
L1
vers:all/*

// Remediations (5)

Mitigation: Schneider Electric is establishing a remediation plan for all future versions of • Modicon M340
Schneider Electric is establishing a remediation plan for all future versions of • Modicon M340 • BMXNOR0200H • BMXNGD0100 • BMXNOC401 We will update this document when the remediation is available. Until then, customers should immediately apply the following mitigations to reduce the risk of exploit: • FTP service is disabled by default • Ensure to disable FTP service when not in use • Setup network segmentation and implement a firewall to block all unauthorized access to ports 21/FTP • Use VPN (Virtual Private Networks) tunnels if remote access is required
Patch: Version 6.80 of BMXNOE0110 includes a fix for this vulnerability and is available for download her
Version 6.80 of BMXNOE0110 includes a fix for this vulnerability and is available for download here: https://www.se.com/ww/en/product/BMXNOE0110/ethernettcp-ip-network-module-modicon-m340-automation-platformflash-memory-card-internal-ram-16-mb-1-x-rj45-10-100/ Reboot is needed to complete the firmware upgrade
Patch: Version 3.60 of BMXNOE0100 includes a fix for this vulnerability and is available for download her
Version 3.60 of BMXNOE0100 includes a fix for this vulnerability and is available for download here: https://www.se.com/ww/en/product/BMXNOE0100/networkmodule-modicon-m340-modbus-tcp-1-x-rj45-flash-memorycard/ Reboot is needed to complete the firmware upgrade
Patch: Version SV3.70 of Modicon M340 includes a fix for this vulnerability and is available for download h
Version SV3.70 of Modicon M340 includes a fix for this vulnerability and is available for download here: https://www.se.com/ww/en/product-range/1468-modicon-m340/#software-and-firmware
Mitigation: If customers choose not to apply the remediation provided above, they should immediately apply the f
If customers choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploit: • FTP service is disabled by default • Ensure to disable FTP service when not in use • Setup network segmentation and implement a firewall to block all unauthorized access to ports 21/FTP • Use VPN (Virtual Private Networks) tunnels if remote access is required

// References