modbus/tcp

About this tag
Modbus/TCP is a widely used industrial protocol that connects programmable logic controllers, remote terminal units, and energy meters in operational technology environments. Recent security advisories from CISA and vendors such as ABB, Schneider Electric, Shelly, and Mitsubishi Electric highlight vulnerabilities in Modbus/TCP implementations, including buffer over-reads, denial-of-service flaws, and unauthenticated read/write access. These issues affect devices like ABB AC500 PLCs, Schneider Modicon M340 and SCADAPack RTUs, Shelly Pro 3EM energy meters, and Mitsubishi MELSEC iQ-F CPUs. Mitigations often involve firmware updates, network segmentation, and disabling unnecessary services. The tag covers OT security, patch management, and industrial control system hardening related to Modbus/TCP.

  1. CISA Republished ABB CVE-2025-7745: Modbus PLC Buffer Over-Read Risk (OT + Windows)

    CISA on May 26, 2026 republished ABB’s advisory for CVE-2025-7745, a medium-severity buffer over-read flaw in ABB AC500 V2 PLC firmware that can expose fragments of earlier Modbus responses when unsupported function codes are sent to the device’s Modbus server. The bug is not a headline-grabbing...
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  2. CVE-2026-0667 Patch: Schneider SCADAPack RTUs and RemoteConnect on Modbus TCP

    Schneider Electric has published an urgent security notification: a high‑severity flaw (CVE‑2026‑0667) in its SCADAPack™ x70 family and RemoteConnect software can be triggered over Modbus TCP and — if left unpatched — may allow remote attackers to cause denial of service, execute arbitrary code...
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    • industrial automation modbus/tcp patch management scada security
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  3. Shelly Pro 3EM Modbus DoS Vulnerability CVE-2025-12056 Explained

    Shelly’s Pro 3EM smart DIN-rail energy meter contains a Modbus parsing bug that CISA calls an out‑of‑bounds read leading to a reboot and denial‑of‑service; the agency assigned CVE‑2025‑12056 and reported a CVSS v4 base score of 8.3, warning operators that specially crafted Modbus requests can...
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    • cve 2025 12056 denial of service modbus/tcp shelly pro 3em
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  4. Modicon M340 CVE-2024-5056 Patch BMXNOE0100/0110 & OT Network Mitigations

    Schneider Electric has confirmed a security issue affecting the Modicon M340 family and two Ethernet communication modules — BMXNOE0100 and BMXNOE0110 — that can expose files or directories to external parties and, in some configurations, can prevent firmware updates or disrupt the embedded...
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    • acl bmxnoe0100 bmxnoe0110 cisa cve-2024-5056 cwe-552 cybersecurity directory exposure firmware firmware integrity ftp ics modbus/tcp modicon m340 network segmentation schneider electric sevd-2024-163-01 web server
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    • Forum: Security Alerts

  5. MELSEC iQ-F Modbus/TCP CVE-2025-7405: Mitigation Guide for Windows & OT

    Mitsubishi Electric’s MELSEC iQ‑F family of CPU modules has been formally flagged with a network‑accessible vulnerability that allows unauthenticated remote actors to read and write device values — and in some deployments to halt program execution — because the affected product’s Modbus/TCP...
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    • asset inventory cisa cve-2025-7405 cwe-306 cybersecurity firmware ics security industrial control systems ip filtering jump-host melsec iq-f mitsubishi electric vulnerability modbus/tcp network segmentation plc vulnerabilities remote maintenance security siem monitoring vpn windows ot
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    • Forum: Security Alerts

  6. Schneider M340 FTP DoS Flaw CVE-2025-6625: Patch, Mitigations, and OT Hardening

    Schneider Electric has acknowledged a high-severity vulnerability in its Modicon M340 family and several M340 communication modules that can be triggered remotely by a specially crafted FTP command and may cause a denial-of-service condition; the flaw was assigned CVE‑2025‑6625 and carries a...
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    • bmxnoe0100 bmxnoe0110 cisa cve-2025-6625 cybersecurity dos vulnerability firmware ftp command vulnerability ics security industrial control systems modbus/tcp modicon m340 network segmentation patch management remote access hardening schneider electric sv03.60 sv06.80 windows engineering
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    • Forum: Security Alerts