CVE-2021-20613

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

Improper initialization vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.16 and prior, FX3U-ENET-L Firmware version 1.16 and prior and FX3U-ENET-P502 Firmware version 1.16 and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition in communication function of the product by sending specially crafted packets. Control by MELSEC-F series PLC is not affected by this vulnerability, but system reset is required for recovery.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-665

Affected software

Vendor	Product	Versions
n/a	MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502	Firmware version 1.16 and prior

References

https://jvn.jp/vu/JVNVU93268332/index.htmlThird Party Advisory, VDB Entry
https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-07Third Party Advisory, US Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-024_en.pdfVendor Advisory
https://jvn.jp/vu/JVNVU93268332/index.htmlThird Party Advisory, VDB Entry
https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-07Third Party Advisory, US Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-024_en.pdfVendor Advisory

Timeline

Published: Jan 14, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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