ICS Advisory (ICSA-21-294-01)

ICONICS GENESIS64 and Mitsubishi Electric MC Works64

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  • CVSS v3 7.8
  • ATTENTION: Low attack complexity
  • Vendor: ICONICS, Mitsubishi Electric
  • Equipment: ICONICS GENESIS64, Mitsubishi Electric MC Works64
  • Vulnerabilities: Out-of-bounds Read, Out-of-bounds Write


Successful exploitation of these vulnerabilities may result in remote code execution.



The vulnerabilities affect the following HMI SCADA products: 

  • GENESIS64 (all versions up to and including 10.97) 
  • MC Works64 (all version of MC Works64, up to and including Version 4.04E)



A lack of proper validation of user-supplied data may result in a write past the end of an allocated data structure. User interaction is required to exploit this vulnerability as the target must attempt to import a malicious AutoCAD DWG file into GraphWorX64.

CVE-2021-27041 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).


A lack of proper validation of user-supplied data may allow reading past the end of an allocated data structure. User interaction is required to exploit this vulnerability as the target must visit a malicious page or open a malicious file.

CVE-2021-27040 has been assigned to this vulnerability. A CVSS v3 base score of 3.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).


  • CRITICAL INFRASTRUCTURE SECTORS: Multiple including Critical Manufacturing
  • COMPANY HEADQUARTERS LOCATION: ICONICS is headquartered in the United States. Mitsubishi Electric is headquartered in Japan.


Michael DePlante of Trend Micro’s Zero Day Initiative reported these vulnerabilities to CISA.


ICONICS and Mitsubishi Electric are releasing Critical Fix Rollups or patches for these products. GENESIS64 Version 10.97.1 and later will not be vulnerable to this exploit.

ICONICS and Mitsubishi Electric recommend users of these products take the following mitigation steps:

  • Use a firewall. Place control system networks and devices behind firewalls and isolate them from the business network.
  • Minimize network exposure for all control system devices. Control system devices should not directly face the Internet.
  • Do not click web links or open unsolicited attachments in email messages.
  • When importing any AutoCad DWG file, make sure it is known to come from a trusted source.
  • Install the applicable Critical Fix Rollup, when available.

ICONICS provides information and useful links related to its security updates at its company website.

Mitsubishi Electric provides information and useful links related to this security update at its company website.

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

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.

No known public exploits specifically target these vulnerabilities. These vulnerabilities are not exploitable remotely.

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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