high severity August 27, 2026 · 1 min read

CISA ICS Advisory: Mitsubishi Electric Multiple FA Products (Update D)

Here’s what this advisory affects, and what to do about it.

Successful exploitation of this vulnerability could allow a remote attacker to cause a denial-of-service (DoS) condition, a timeout error, or a communication delay by sending a specially crafted UDP packet to the product. The following versions of Mitsubishi Electric Multiple FA Products (Update D) are affected: Mitsubishi Electric CC-Link IE TSN Remote I/O module NZ2GN2S1-32D Mitsubishi Electric CC-Link IE TSN Remote I/O module NZ2GN2S1-32T Mitsubishi Electric CC-Link IE TSN Remote I/O module NZ2GN2S1-32TE Mitsubishi Electric CC-Link IE TSN Remote I/O module NZ2GN2S1-32DT Mitsubishi Electric

CISA ICS Advisory: Mitsubishi Electric Multiple FA Products (Update D)

On August 27, 2026, the Cybersecurity and Infrastructure Security Agency (CISA) published an updated Industrial Control Systems (ICS) advisory detailing a vulnerability in specific Mitsubishi Electric factory automation products.

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Remote DoS via crafted UDP packet

The advisory states that successful exploitation of the vulnerability could allow a remote attacker to cause a denial-of-service condition, a timeout error, or a communication delay by sending a specially crafted UDP packet to the affected product. The advisory does not say whether the flaw has been exploited in the wild.

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Affected products

The following CC-Link IE TSN Remote I/O modules are affected:

NZ2GN2S1-32D
NZ2GN2S1-32T
NZ2GN2S1-32TE
NZ2GN2S1-32DT

No other versions or products are named in the advisory.

What to do

Check operational environments for the four listed NZ2GN2S1- module part numbers.
Apply the updated firmware or mitigations provided by Mitsubishi Electric for these specific modules.
Restrict network access to the affected modules so that untrusted UDP traffic cannot reach them.
Monitor Mitsubishi Electric’s official support channels for any further updates to this advisory.
Review network segmentation controls for ICS environments that use CC-Link IE TSN.

Organizations operating industrial control systems should treat this class of remote denial-of-service vulnerability as a priority for networks where availability is critical.

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Sources: CISA ICS Advisory

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