CVE-2021-20612

Lack of administrator control over security vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.14 and prior, FX3U-ENET-L Firmware version 1.14 and prior and FX3U-ENET-P502 Firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition in communication function of the product or other unspecified effects by sending specially crafted packets to an unnecessary opening of TCP port. Control by MELSEC-F series PLC is not affected by this vulnerability, but system reset is required for recovery.

• https://jvn.jp/vu/JVNVU93268332/index.htmlThird Party Advisory, VDB Entry
• https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01Third Party Advisory, US Government Resource
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-023_en.pdfVendor Advisory
• https://jvn.jp/vu/JVNVU93268332/index.htmlThird Party Advisory, VDB Entry
• https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01Third Party Advisory, US Government Resource
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-023_en.pdfVendor Advisory

Published

Jan 14, 2022

Last Modified

Jun 17, 2026

Status

Modified

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