Vulnerability · Published Jun 19, 2026 · Assigned by Mitsubishi
CVE-2026-8805Denial-of-service (DoS) vulnerability in MELSEC iQ-F Series EtherNet/IP module
High 8.7
In plain English
A high-severity integer overflow in Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP from Mitsubishi Electric Corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Official description
Integer Overflow or Wraparound vulnerability in the EtherNet/IP function of Mitsubishi Electric 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 in the affected product by rapidly establishing a large number of TCP connections to it, resulting in an inconsistency in the product's internal connection management process and triggering improper memory access.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mitsubishi Electric Corporation | Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP | versions 1.000 and prior |
Weakness: CWE-190 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2026-002_en.pdf vendor-advisory
- https://jvn.jp/vu/JVNVU97140216/ government-resource
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-169-05 government-resource