Schneider Electric has disclosed a vulnerability in its Modicon M340 Controller and Communication Modules tracked as CVE-2025-6625. The issue stems from improper input validation in multiple firmware versions and could allow an unauthenticated attacker to send a crafted FTP command that triggers a Denial of Service condition, rendering affected devices unavailable. The vulnerability has a CVSS v3 base score of 7.5 (High).

Which products are affected?

Modicon M340 Ethernet/Serial RTU Module, M580 Global Data module, Ethernet/Serial RTU Module, Modbus/TCP Ethernet Modicon M340 module, Modbus/TCP Ethernet Modicon M340 FactoryCast module, Modicon M340 Controller firmware prior to SV3.70

What should defenders do?

Apply vendor-released firmware updates: BMXNOE0100 version 3.60, BMXNOE0110 version 6.80, Modicon M340 Controller SV3.70, BMXNOR0200H SV1.7_IR27. As interim mitigations, disable FTP service when not in use, implement network segmentation, block unauthorized access to port 21/FTP via firewall, and use VPN tunnels for remote access.

highVulnerability

Schneider Electric Modicon M340 Vulnerability Allows Denial of Service via FTP

CVE-2025-6625 affects Modicon M340 controllers and communication modules; CVSS 7.5

CyberIntel DeskPublished 12 days agoUpdated less than a minute ago2 min read

Key Takeaways

CVE-2025-6625 is an Improper Input Validation vulnerability in Schneider Electric Modicon M340 controllers and communication modules.
The vulnerability could allow a Denial of Service attack via a crafted FTP command.
CVSS v3 base score is 7.5, classified as High severity.
Affected products span multiple Modicon M340 and M580 communication modules across various firmware versions.
Firmware updates are available; FTP is disabled by default, reducing the attack surface.

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