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-2016-9218

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.3%; EPSS 1.3% chance of exploitation in 30 days, percentile 70%
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. Weakly encrypted passwords are transmitted to a MELSEC-Q PLC.

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

1.31% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

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

Classification

Weakness

CWE-327 Use of a Broken or Risky Cryptographic Algorithm

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-2016-8370
NVD CVE-2016-8370

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