An issue was discovered in Mitsubishi Electric Automation MELSEC-Q series Ethernet interface modules QJ71E71-100, all versions, QJ71E71-B5,…

published 2017-02-13 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-9216

cvss: 8.6; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.6%; EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-16-336-03 updated 2025-06-05 cvss 8.6

Mitsubishi Electric MELSEC-Q Series Ethernet Interface Module Vulnerabilities

Mitsubishi Electric QJ71E71-100 Mitsubishi Electric QJ71E71-B2 Mitsubishi Electric QJ71E71-B5
affected: mitigation “Mitsubishi Electric strongly recommends that users should operate the affected device behind a firewall.” us.mitsubishielectric.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

2.61% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

n/a Mitsubishi Electric MELSEC-Q Series Ethernet Interface Module

Classification

Weakness

CWE-662 Improper Synchronization

References

ics-cert.us-cert.gov /advisories/ICSA-16-336-03
mitigation, third-party-advisory, us-government-resource
securityfocus.com /bid/94632
vdb-entry, third-party-advisory

Sources

CVE List CVE-2016-8368
NVD CVE-2016-8368

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary