7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
COMPLETE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:C/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.8 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
51.5%
Successful exploitation of this vulnerability could allow the systemβs operations to be adversely affected.
The following Mitsubishi Electric human-machine interface (HMI) products are affected:
The affected product is vulnerable to an information tampering vulnerability, which may allow an attacker to send a malicious packet to rewrite the device value and adversely affect the systemβs operation.
CVE-2021-20601 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
Parul Sindhwad and Dr. Faruk Kazi of COE-CNDS Lab, VJTI, Mumbai, India, reported this vulnerability to Mitsubishi Electric.
Mitsubishi Electric recommends users take measures such as installing a firewall to protect the GOT and system from unauthorized access from external equipment via the network.
Mitsubishi Electric recommends users take the following mitigation measures to minimize the risk of exploiting this vulnerability:
For more information, please contact the local Mitsubishi Electric representative or refer to the Mitsubishi Electric support website.
For specific update instructions and additional details, see the Mitsubishi Electric advisory.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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-12-146-01BβTargeted 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 this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-20601
cwe.mitre.org/data/definitions/20.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Mitsubishi%20Electric%20GOT%20products+https://www.cisa.gov/news-events/ics-advisories/icsa-21-320-02
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics/alerts/ICS-ALERT-10-301-01
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-21-320-02
www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-018_en.pdf
www.mitsubishielectric.com/fa/support/index.html
www.oig.dhs.gov/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-21-320-02
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Mitsubishi%20Electric%20GOT%20products&body=www.cisa.gov/news-events/ics-advisories/icsa-21-320-02
7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
COMPLETE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:C/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.8 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
51.5%