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CVE-2026-8805: Denial-of-service (DoS) vulnerability in MELSEC iQ-F Series EtherNet/IP module

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-19 · updated 2026-10-26
• Weakness: CWE-190

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

• Mitsubishi Electric Corporation Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP: through versions 1.000

References

• https://jvn.jp/vu/JVNVU97140216/
• https://www.cisa.gov/news-events/ics-advisories/icsa-26-169-05
• https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2026-002_en.pdf

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