CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
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
AI Score
Confidence
High
EPSS
Percentile
62.1%
This updated advisory is a follow-up to the original advisory titled ICSA-21-112-02 Mitsubishi Electric GOT that was published April 22, 2021, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of this vulnerability may allow an attacker to gain unauthorized access.
Mitsubishi Electric reports the vulnerability affects the VNC function of the following devices:
--------- Begin Update A Part 1 of 2 ---------
To check the version in use, please refer to the userβs manual available from the Mitsubishi Electric FA Global website.
--------- End Update A Part 1 of 2 ---------
A password authentication bypass vulnerability exists in the VNC function of the GOT2000 series and the GOT SIMPLE series due to improper authentication.
CVE-2021-20590 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N).
Mitsubishi Electric reported this vulnerability to CISA.
--------- Begin Update A Part 2 of 2 ---------
Mitsubishi Electric instructs users to restrict access to the product only from trusted networks and hosts until they can update to one of the following fixed versions:
Please refer to the Mitsubishi Electric website for details and update procedures.
--------- End Update A Part 1 of 2 ---------
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. This vulnerability has high attack complexity.
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CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
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
AI Score
Confidence
High
EPSS
Percentile
62.1%