ICS Advisory (ICSA-20-212-03)

Mitsubishi Electric Factory Automation Products Path Traversal (Update C)

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  • CVSS v3 8.3
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Mitsubishi Electric
  • Equipment: Mitsubishi Electric, Factory Automation products
  • Vulnerability: Path Traversal


This updated advisory is a follow-up to the advisory update titled ICSA-20-212-03 Mitsubishi Electric Factory Automation Products Path Traversal (Update B) that was published May 27, 2021, to the ICS webpage on cisa.gov/ics.


Successful exploitation of this vulnerability may allow an attacker to obtain unauthorized information, tamper the information, and cause a denial-of-service condition.



The following products and versions are affected:

  • CW Configurator,Versions 1.010L and prior
  • FR Configurator2, Versions 1.22Y and prior
  • GX Works2, Versions 1.595V and prior
  • GX Works3, Versions 1.063R and prior
  • MELSEC iQ-R Series Motion Module, Versions 10 and prior
  • MELSOFT iQ AppPortal, Version 1.17T and prior
  • MELSOFT Navigator, 2.70Y and prior

--------- Begin Update C Part 1 of 2 --------- 

  • MI Configurator, versions 1.004E and prior

--------- End Update C Part 1 of 2 ---------

  • MR Configurator2, Version 1.110Q and prior
  • MT Works2, Versions 1.156N and prior
  • MX Component, Version 4.20W and prior
  • RT ToolBox3, Versions 1.70Y and prior



Multiple Mitsubishi Electric Factory Automation products have a vulnerability that allows an attacker to execute arbitrary code.

CVE-2020-14523 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/C:H/I:H/A:H).




Mashav Sapir of Claroty reported this vulnerability to CISA.


Mitsubishi Electric recommends the following mitigations:

Download the latest version of each software product and update. The fixed software products and versions are as follows:

  • CW Configurator, Version 1.011M or later
  • FR Configurator2, Version 1.23Z or later
  • GX Works2, Version 1.596W or later
  • GX Works3, Version 1.065T or later
  • MELSEC iQ-R Series Motion Module, Version 12 and later
  • MELSOFT iQ AppPortal, Version 1.20W or later
  • MELSOFT Navigator, Versions 2.74C or later

--------- Begin Update C Part 2 of 2 --------- 

  • MI Configurator, Versions 1.005F or later

-------- End Update C Part 2 of 2 --------- 

  • MR Configurator2, Versions 1.115V or later
  • MT Works2, Versions 1.160S or later
  • MX Component, Versions 4.21X or later
  • RT ToolBox3, Versions 1.80J or later

For users of a product that has not released a fixed version or who cannot immediately update the product, Mitsubishi Electric recommends taking the following mitigation measures to minimize risk:

  • Make sure the file is obtained from the correct acquisition route when receiving a project file or a configuration data file from another person via email, USB memory, file server, etc.; or check that there is no file of unknown source.
  • Operate the products under an account that does not have administrator privileges. Except for MELSEC iQ-R Series Motion Module.
  • Install an antivirus software in computers using the products. Except for MELSEC iQ-R Series Motion Module.
  • Restrict network exposure for all control system devices or systems to the minimum necessary and ensure they are not accessible from untrusted networks and hosts.
  • Locate control system networks and remote devices behind firewalls and isolate them from the business network.
  • Use virtual private network (VPN) when remote access is required.

Additional information about the vulnerability or Mitsubishi Electric's compensating control is available by contacting a Mitsubishi Electric representative

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.cisa.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.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

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.

CISA also recommends users take the following measures to protect themselves from social engineering attacks: 

No known public exploits specifically target this vulnerability.

Contact Information

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
or incident reporting:  https://us-cert.cisa.gov/report

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