4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
30.8%
This updated advisory is a follow-up to the original advisory titled ICSA-21-350-05 Mitsubishi Electric FA Engineering Software that was published December 16, 2021, on the ICS webpage on cisa.gov/ics.
Successful exploitation of these vulnerabilities may cause a denial-of-service condition.
The following versions of FA Engineering Software, an engineering software suite, are affected:
--------- Begin Update B Part 1 of 2 ---------
--------- End Update B Part 1 of 2 ---------
When a valid user opens a malicious project file specially crafted by an attacker, the software reads data outside of the intended buffer, allowing an attacker to potentially cause a denial-of-service condition in the software.
CVE-2021-20606 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
When a valid user opens a malicious project file specially crafted by an attacker, the product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
CVE-2021-20607 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
Mitsubishi Electric reported these vulnerabilities to CISA.
Mitsubishi Electric recommends that users download and update the latest version of each software product:
--------- Begin Update B Part 2 of 2 ---------
--------- End Update B Part 2 of 2 ---------
Mitsubishi Electric has included the following directions for users looking to update to the fixed software version:
For customers who use the software for which the fixed version has not been released or who are not able to immediately update the software, Mitsubishi Electric recommends the following mitigation measures to minimize the risk of being exploited these vulnerabilities:
For specific update instructions and additional details see the Mitsubishi Electric advisory.
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-12-146-01BโTargeted 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-2021-20606
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-20607
cwe.mitre.org/data/definitions/125.html
cwe.mitre.org/data/definitions/191.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
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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
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_en.pdf
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mailto:?subject=Mitsubishi%20Electric%20FA%20Engineering%20Software%20%28Update%20B%29&body=www.cisa.gov/news-events/ics-advisories/icsa-21-350-05
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
30.8%