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Mitsubishi Electric Co.'s MELSEC iQ-F Series FX5-ENET/IP Ethernet Module

HIGH
CVSS 7.5
Date 2026-06-18T06:00:00+00:00
Source cisa-csaf
Published by CISA

// Description

Successful exploitation of this vulnerability could allow a remote attacker to cause a denial-of-service (DoS) condition in the affected product by continuously sending a large number of communication packets to the Ethernet port of the product in a short period of time, increasing the processing load of the product, preventing the internal anomaly-detection processing from being performed, and causing the communication function to stop.

// Vulnerabilities (1)

CVE ID CVSS Score Severity Description
CVE-2026-8806 7.5 high
Expected Behavior Violation (CWE-440) vulnerability exists in MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP. This vulnerability could allow a remote attacker to cause a denial-of-service (DoS) condition in the affected product by continuously sending a large number of communication packets to the Ethernet port of the product in a short period of time, increasing the processing load of the product, preventing the internal anomaly-detection processing from being performed, and causing the communication function to stop.

// Remediations (5)

Mitigation: For customers, Mitsubishi Electric recommends installing anti-virus software on PCs that can access
For customers, Mitsubishi Electric recommends installing anti-virus software on PCs that can access the affected product, to minimize the risk of exploiting this vulnerability.
Mitigation: For customers, Mitsubishi Electric recommends restricting physical access to the affected product, a
For customers, Mitsubishi Electric recommends restricting physical access to the affected product, as well as to PCs and network devices to which it is connected, to minimize the risk of exploiting this vulnerability.
Mitigation: For customers, Mitsubishi Electric recommends using the affected product within a LAN and blocking a
For customers, Mitsubishi Electric recommends using the affected product within a LAN and blocking access from untrusted networks and hosts through firewalls, to minimize the risk of exploiting this vulnerability.
Mitigation: For customers, Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc.
For customers, Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required, to minimize the risk of exploiting this vulnerability.
Mitigation: For customers, Mitsubishi Electric recommends using the IP filter function of the affected product t
For customers, Mitsubishi Electric recommends using the IP filter function of the affected product to block access from untrusted hosts and minimize the risk of exploiting this vulnerability. For details on the IP filter function, refer to "13.1 IP Filter Function" in the MELSEC iQ-F FX5 User's Manual (Communication) which can be downloaded from the link "https://www.mitsubishielectric.com/fa/download/index.html."

// References