CVE-2020-5665

7.4 highEPSS 1.0%

High (7.4) in mitsubishielectric melsec iq-f fx5u cpu firmware. EPSS 1.0% chance of exploitation in the next 30 days.

Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.

Severity

CVSS 3.1

7.4 high

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS: 1.0% chance of exploitation in the next 30 days; higher than 63% of CVEs (scores of 2026-10-31)
Published: 2020-12-14
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mitsubishielectric:melsec_iq-f_fx5u_cpu_firmware

References

https://jvn.jp/vu/JVNVU95638588/index.html
https://us-cert.cisa.gov/ics/advisories/icsa-20-345-01
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-018.pdf
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-018_en.pdf
https://jvn.jp/vu/JVNVU95638588/index.html

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