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AUSCERT External Security Bulletin Redistribution
ICS Advisory (ICSA-22-314-07) Omron NJ/NX-series Machine
11 November 2022
AusCERT Security Bulletin Summary
Product: Omron NJ/NX-series Machine Automation Controllers
Operating System: Network Appliance
CVE Names: CVE-2022-33971
Comment: CVSS (Max): 8.3 CVE-2022-33971 (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H)
CVSS Source: ICS-CERT
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ICS Advisory (ICSA-22-314-07)
Omron NJ/NX-series Machine Automation Controllers
Original release date: November 10, 2022
All information products included in https://us-cert.cisa.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
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is governed by the Traffic Light Protocol (TLP) marking in the header. For more
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1. EXECUTIVE SUMMARY
o CVSS v3 8.3
o ATTENTION: Exploitable remotely, public exploits are available
o Vendor: Omron
o Equipment: NJ/NX-series Machine Automation Controllers
o Vulnerability: Active Debug Code
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to obtain
unauthorized access to the device and cause the device to be in an "out of
service" state or execute a malicious program on the device.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following products of the NJ/NX-series Machine Automation Controllers are
o NX7-series Machine Automation Controller (All Models): Versions 1.28 and
o NX1-series Machine Automation Controller (All Models): Versions 1.48 and
o NJ-series Machine Automation Controller (All Models): Versions 1.48 and
3.2 VULNERABILITY OVERVIEW
3.2.1 ACTIVE DEBUG CODE CWE-489
An attacker who can analyze the communication of the affected product and
perform capture-replay can find unintended entry points into the affected
product and cause a denial-of-service condition or execute a malicious program.
CVE-2022-33971 has been assigned to this vulnerability. A CVSS v3 base score of
8.3 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:C/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
Reid Wightman of Dragos reported this vulnerability to CISA.
Omron recommends updating versions of NJ/NX-series machine automation
controllers to address this vulnerability. These updates are available to users
by contacting their Omron or distributors :
o NX7-series Machine Automation Controller (All Models): Versions 1.29 or
o NX1-series Machine Automation Controller (All Models): Versions 1.50 or
o NJ-series Machine Automation Controller (NJ501-1300, NJ501-1400,
NJ501-1500): Versions 1.49 or higher
o NJ-series Machine Automation Controller (All other Models): Versions 1.50
Omron recommends users take the following mitigation measures to minimize the
risk of exploitation of this vulnerability:
Enable antivirus protection:
o Protect any PC with access to the control system against malware by
ensuring the installation and maintenance of up-to-date commercial grade
antivirus software protection.
Implement security measures to prevent unauthorized access:
o Minimize connection of control systems and equipment to open networks
preventing untrusted devices from accessing them.
o Implement firewalls by shutting down unused communications ports, limiting
communications between hosts, and isolate affected systems from the IT
o Use a virtual private network (VPN) for remote access to control systems
o Use strong passwords and change passwords frequently.
o Install physical controls that only permit authorized personnel access to
control systems and equipment.
o Scan USB drives or similar devices for viruses and malware to ensure the
devices are safe before connecting them to systems and devices.
o When possible, enforce multifactor authentication (MFA) on all devices with
remote access to control systems and equipment.
Protect data input and output:
o Perform process validation, such as backup validation or range checks, to
cope with unintentional modification of input/output data to control
systems and devices.
Use data recovery:
o Conduct periodical data backups and maintenance to prepare for potential
For more information see Omron's advisory: OMSR-2022-002
This vulnerability and countermeasures correspond to the those reported in the
CISA ICS Alert: APT Cyber Tools Targeting ICS/SCADA Devices .
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 at cisa.gov/ics. Several CISA products detailing cyber
defense best practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
This vulnerability has a high attack complexity.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
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