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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-20-282-02) Mitsubishi Electric MELSEC iQ-R Series
9 October 2020
AusCERT Security Bulletin Summary
Product: Mitsubishi Electric MELSEC iQ-R Series
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2020-16850
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ICS Advisory (ICSA-20-282-02)
Mitsubishi Electric MELSEC iQ-R Series
Original release date: October 08, 2020
All information products included in https://us-cert.gov/ics are provided"as
is" for informational purposes only. The Department of Homeland Security (DHS)
does not provide any warranties of any kind regarding any information contained
within. DHS does not endorse any commercial product or service, referenced in
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1. EXECUTIVE SUMMARY
o CVSS v3 8.6
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Mitsubishi Electric
o Equipment: MELSEC iQ-R Series
o Vulnerability: Uncontrolled Resource Consumption
2. RISK EVALUATION
Successful exploitation of this vulnerability could result in a
denial-of-service condition due to uncontrolled resource consumption.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following MELSEC iQ-R series modules are affected:
o R00/01/02CPU, all versions
o R04/08/16/32/120(EN)CPU, all versions
o R08/16/32/120SFCPU, all versions
o R08/16/32/120PCPU, all versions
o R16/32/64MTCPU, all versions
3.2 VULNERABILITY OVERVIEW
3.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
An uncontrolled resource consumption (CWE-400) vulnerability resulting in a
denial-of-service condition may be caused when an attacker sends specially
crafted packets to MELSEC iQ-R series modules.
CVE-2020-16850 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/C:N/
o CRITICAL INFRASTRUCTURE SECTORS : Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED : Worldwide
o COMPANY HEADQUARTERS LOCATION : Japan
Yossi Reuven of SCADAfence reported this vulnerability to Mitsubishi Electric.
Mitsubishi Electric plans to release a patch during the coming months, and this
publication will be updated with that patch information once available. Please
contact a Mitsubishi Electric representative with questions.
Mitsubishi Electric recommends users take the following mitigation measures to
minimize the risk of exploiting this vulnerability:
o Use a firewall or virtual private network (VPN), etc., to prevent
unauthorized access if Internet access is required.
o Use within a LAN and block access from untrusted networks and hosts through
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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