CVE-2021-20612

HIGH

MELSEC-F series FX3U-ENET Firmware < 1.14 - Unauthenticated Denial of Service via TCP Port

Title source: llm
STIX 2.1

Description

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.

References (3)

Core 3
Core References
Third Party Advisory, VDB Entry x_refsource_misc
https://jvn.jp/vu/JVNVU93268332/index.html
Third Party Advisory, US Government Resource x_refsource_misc
https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01

Scores

CVSS v3 7.5
EPSS 0.0035
EPSS Percentile 57.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

Status published
Products (3)
mitsubishielectric/fx3u-enet-l_firmware < 1.14
mitsubishielectric/fx3u-enet-p502_firmware < 1.14
mitsubishielectric/fx3u-enet_firmware < 1.14
Published Jan 14, 2022
Tracked Since Feb 18, 2026