CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:S/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
46.0%
Successful exploitation of these vulnerabilities could allow an attacker to gain unauthorized access to the Data Communication Network (DCN) routing configuration and cause a disruption to the Network Management (NMS) and Network Element (NE) communication.
The following versions of XMC20 and FOX61x, multi-service network elements, are affected:
This vulnerability is a weak default credential associated with TCP Port 26. Successful exploitation of this vulnerability could allow an attacker to gain unauthorized access to the DCN routing configuration.
CVE-2021-40333 has been assigned to this vulnerability. A CVSS v3 base score of 9.0 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H).
This vulnerability is due to the implementation of the proprietary management protocol (TCP Port 5558), in which if SSH is activated, could cause a disruption to the NMS and NE communication.
CVE-2021-40334 has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
Hitachi Energy reported these vulnerabilities to CISA.
Hitachi Energy recommends users to upgrade to the most current version of their products:
Please refer to the Hitachi Energy XMC20 advisory for more details on affected module information.
Please refer to the Hitachi Energy FOX61x advisory for more details on affected module information.
Hitachi Energy recommends the following security practices and firewall configurations to help protect process control networks from attacks that originate from outside the network:
For additional information and access to updated firmware, please contact the Hitachi Energy service organization.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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-12-146-01B–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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-40333
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-40334
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-21-341-02
cwe.mitre.org/data/definitions/431.html
cwe.mitre.org/data/definitions/521.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
search.abb.com/library/Download.aspx?DocumentID=8DBD000062&LanguageCode=en&DocumentPartId=&Action=Launch
search.abb.com/library/Download.aspx?utm_campaign=2021.11_5284_Cybersecurity%20Advisory&utm_content=2021.11_5284_Cybersecurity%20Advisory&utm_medium=email&utm_source=Eloqua&DocumentID=8DBD000069&LanguageCode=en&DocumentPartId=&Action=Launch&elqTrackId=167bcd9389a64fd18712fed9e03369c5&elq=87e5aaeebcf8446ba531f043a55760c0&elqaid=3849&elqat=1&elqCampaignId=3265
twitter.com/CISAgov
twitter.com/intent/tweet?text=Hitachi%20Energy%20XMC20%20and%20FOX61x+https://www.cisa.gov/news-events/ics-advisories/icsa-21-341-02
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics
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
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-21-341-02&title=Hitachi%20Energy%20XMC20%20and%20FOX61x
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
www.hitachienergy.com/contact-us/
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-21-341-02
www.oig.dhs.gov/
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Hitachi%20Energy%20XMC20%20and%20FOX61x&body=www.cisa.gov/news-events/ics-advisories/icsa-21-341-02
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:S/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
46.0%