CVE-2026-1874: Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series EtherNet/IP module and Ethernet module
Always-Incorrect Control Flow Implementation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP versions 1.106 and prior and Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP versions 1.000 and prior allows a remote attacker to cause a denial-of-service (DoS) condition on the products by continuously sending UDP packets to the products. A system reset of the product is required for recovery.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-1874?
CVE-2026-1874 has a Denial-of-Service (DoS) severity level.
How do I fix CVE-2026-1874?
To fix CVE-2026-1874, upgrade the firmware of the Mitsubishi Electric MELSEC iQ-F Series FX5-ENET/IP Ethernet Module to version 1.107 or later.
What systems are affected by CVE-2026-1874?
CVE-2026-1874 affects the MELSEC iQ-F Series FX5-ENET/IP Ethernet Module and FX5-EIP EtherNet/IP Module versions up to 1.106.
What type of attack can exploit CVE-2026-1874?
CVE-2026-1874 can be exploited through a Denial-of-Service attack which disrupts normal function.
Is there a workaround for CVE-2026-1874?
Currently, there are no known workarounds for CVE-2026-1874; firmware update is recommended for mitigation.