CVE-2021-20596

HIGH

MELSEC-F FX3U-ENET Firmware < 1.14 - DoS via Crafted Packets

Title source: llm
STIX 2.1

Description

NULL Pointer Dereference 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 DoS condition in communication by sending specially crafted packets. Control by MELSEC-F series PLC is not affected and system reset is required for recovery.

References (3)

Core 3
Core References
Patch, Third Party Advisory x_refsource_misc
https://jvn.jp/vu/JVNVU94348759/index.html
Third Party Advisory x_refsource_misc
https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01

Scores

CVSS v3 7.5
EPSS 0.0057
EPSS Percentile 68.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-476
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 Jul 22, 2021
Tracked Since Feb 18, 2026