CVE-2026-1874 Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series EtherNet/IP module and Ethernet module
Remote attackers can cause denial of service on Mitsubishi MELSEC iQ-F Ethernet modules by sending continuous UDP packets, requiring a system reset to recover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1874?
CVE-2026-1874 is a high-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP, published on 3 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-670
Which versions are affected by CVE-2026-1874?
It affects 2 products.
Products include Mitsubishielectric Melsec Iq-F Fx5-Eip Firmware, Mitsubishielectric Melsec Iq-F Fx5-Enet\/Ip Firmware.
How do I fix CVE-2026-1874?
No fix has been published for CVE-2026-1874 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-1874 being exploited?
There is no known exploitation of CVE-2026-1874 in the wild and no public exploit code.
Other vulnerabilities in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP
Sources
Also known as GHSA-2595-pf9f-6g58.