Description
An issue was discovered in Mitsubishi Electric Automation MELSEC-Q series Ethernet interface modules QJ71E71-100, all versions, QJ71E71-B5, all versions, and QJ71E71-B2, all versions. The affected Ethernet interface module is connected to a MELSEC-Q PLC, which may allow a remote attacker to connect to the PLC via Port 5002/TCP and cause a denial of service, requiring the PLC to be reset to resume operation. This is caused by an Unrestricted Externally Accessible Lock.
Scores
CVSS v3
8.6
EPSS
0.0088
EPSS Percentile
75.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Details
CWE
CWE-662
Status
published
Products (4)
mitsubishielectric/qj71e71-100_firmware
mitsubishielectric/qj71e71-b2_firmware
mitsubishielectric/qj71e71-b5_firmware
n/a/Mitsubishi Electric MELSEC-Q Series Ethernet Interface Module
Mitsubishi Electric MELSEC-Q Series Ethernet Interface Module
Published
Feb 13, 2017
Tracked Since
Feb 18, 2026