CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
80.5%
This updated advisory is a follow-up to the advisory update titled ICSA-21-049-02 Mitsubishi Electric FA Engineering Software Products (Update F) that was published August 2, 2022, to the ICS webpage on cisa.gov/ics.
Successful exploitation of these vulnerabilities may cause a denial-of-service condition.
Mitsubishi Electric reports these vulnerabilities affect the following FA Engineering Software Products that communicate with MELSEC, FREQROL, or GOT products:
--------- Begin Update G Part 1 of 2 ---------
--------- End Update G Part 1 of 2 ---------
A malicious attacker may cause a denial-of-service condition by spoofing MELSEC, GOT, or FREQROL, and returning crafted reply packets.
CVE-2021-20587 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
A malicious attacker may cause a denial-of-service condition by spoofing MELSEC, GOT, or FREQROL, and returning crafted reply packets.
CVE-2021-20588 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
dliangfun reported these vulnerabilities to Mitsubishi Electric.
Mitsubishi Electric recommends that users download and update the latest version of each software product:
--------- Begin Update G Part 2 of 2 ---------
--------- End Update G Part 2 of 2 ---------
Mitsubishi Electric recommends users who are using a product that has not released a fixed version or who cannot immediately update the product, take the following mitigations to minimize risk:
Refer to the Mitsubishi Electric advisory for details on how to check firmware version.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 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 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-2021-20587
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-20588
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-21-049-02
cwe.mitre.org/data/definitions/122.html
cwe.mitre.org/data/definitions/130.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Mitsubishi%20Electric%20FA%20Engineering%20Software%20Products%20%28Update%20G%29+https://www.cisa.gov/news-events/ics-advisories/icsa-21-049-02
www.cisa.gov/uscert/ics
www.cisa.gov/uscert/ics
www.cisa.gov/uscert/ics/recommended-practices
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.cisa.gov/uscert/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-21-049-02&title=Mitsubishi%20Electric%20FA%20Engineering%20Software%20Products%20%28Update%20G%29
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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-21-049-02
www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-021_en.pdf
www.mitsubishielectric.com/fa/#software
www.oig.dhs.gov/
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Mitsubishi%20Electric%20FA%20Engineering%20Software%20Products%20%28Update%20G%29&body=www.cisa.gov/news-events/ics-advisories/icsa-21-049-02
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
80.5%