Successful exploitation of this vulnerability could cause a denial-of-service condition for the affected product.
Mitsubishi Electric reports the vulnerability affects the following MELSEC iQ-R series CPU module products:
A vulnerability in MELSEC iQ-R series modules causes uncontrolled resource consumption. When a module receives a specially crafted SLMP packet from a malicious attacker, the program execution and communication could enter a denial-of-service condition.
Xiaofei.Zhang reported this vulnerability to Mitsubishi Electric.
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue:
Mitsubishi Electric also recommends the following practices to minimize the risk of exploiting this vulnerability:
For more information about this vulnerability and the associated mitigations, please see the vulnerability information on the Mitsubishi website.
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.
For any questions related to this report, please contact the CISA at:
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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