Is CVE-2026-8805 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-8805 being exploited in the wild.

How severe is CVE-2026-8805?

Informational severity, with a CVSS score of 8.7, published 19 June 2026.

Which products and versions are affected?

Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module 1.000 and prior.

Is there a fix for CVE-2026-8805?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-8805 attacked?

It is attacked over the network.

Am I affected by CVE-2026-8805?

Check whether you run Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-8805: Mitsubishi Electric MELSEC iQ-F FX5-EIP integer overflow in EtherNet/IP

CVE-2026-8805 · Severity: info · CVSS 8.7 · Published 2026-06-19

A vulnerability exists in the Mitsubishi Electric MELSEC iQ-F Series FX5-EIP module, which is used in industrial automation to manage EtherNet/IP communications. An attacker can crash the module by rapidly opening many network connections, leading to a denial-of-service condition. This can disrupt manufacturing processes, stop industrial operations, and require manual intervention to restore service.

Vendors: Mitsubishi Electric.

Quick answers

Is CVE-2026-8805 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-8805 being exploited in the wild.
How severe is CVE-2026-8805?: Informational severity, with a CVSS score of 8.7, published 19 June 2026.
Which products and versions are affected?: Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module 1.000 and prior.
Is there a fix for CVE-2026-8805?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-8805 attacked?: It is attacked over the network.
Am I affected by CVE-2026-8805?: Check whether you run Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An integer overflow or wraparound vulnerability (CWE-190) exists in the EtherNet/IP function of the FX5-EIP module. The flaw is triggered when the device attempts to manage a rapid influx of TCP connections, leading to an inconsistency in the internal connection management process and subsequent improper memory access. A remote, unauthenticated attacker can exploit this over the network to cause a denial-of-service (DoS) condition. Mitsubishi Electric has released firmware version 1.001 to address this issue.

Affected products

Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP 1.000 and prior

Timeline

2026-06-18: advisory: CISA and Mitsubishi Electric published advisories
2026-06-19: disclosed: JVN publication date

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.