Schneider Electric Modicon M340 Controller and Communication Modules Improper Input Validation (CVE-2025-6625)

high Tenable OT Security Plugin ID 504812

Synopsis

The remote OT asset is affected by a vulnerability.

Description

CWE-20: Improper Input Validation vulnerability exists that could cause a Denial Of Service when specific crafted FTP command is sent to the device.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Schneider Electric has identified the following specific workarounds and mitigations users can apply to reduce risk:

- BMXNOE0100 Modbus/TCP Ethernet Modicon M340 module: Version 3.60 of BMXNOE0100 includes a fix for this vulnerability and is available for download here. Reboot is needed to complete the firmware upgrade.
- BMXNOE0110 Modbus/TCP Ethernet Modicon M340 FactoryCast module: Version 6.80 of BMXNOE0110 includes a fix for this vulnerability and is available for download here. Reboot is needed to complete the firmware upgrade.

Schneider Electric is establishing a remediation plan for all future versions of Modicon M340, BMXNOR0200H, BMXNGD0100, and BMXNOC401. Until then, users 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

For more information see the associated Schneider Electric CPCERT security advisory SEVD-2025-224-05.

Plugin Details

Severity: High

ID: 504812

File Name: tenable_ot_schneider_CVE-2025-6625.nasl

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 11/20/2025

Updated: 3/10/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:schneider-electric:bmxgnd0100_firmware, cpe:/o:schneider-electric:bmxnoe0100_firmware, cpe:/o:schneider-electric:bmxnoc0401_firmware, cpe:/o:schneider-electric:bmxnoe0110_firmware, cpe:/o:schneider-electric:bmxnor0200h_firmware, cpe:/o:schneider-electric:modicon_m340_firmware

Required KB Items: Tenable.ot/Schneider

Exploit Ease: No known exploits are available

Patch Publication Date: 8/12/2025

Vulnerability Publication Date: 8/12/2025

Reference Information

CVE: CVE-2025-6625

Detections

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