CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
37.7%
Successful exploitation of this vulnerability could allow an attacker to create a denial-of-service condition.
Rockwell Automation reports the vulnerability affects the following products:
A remote, unauthenticated attacker sending specially crafted commands could cause the PLC to fault when the controller is switched to RUN mode, which results in a denial-of-service condition. If successfully exploited, this vulnerability will cause the controller to fault when the controller is switched to RUN mode.
CVE-2021-33012 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).
Beau Taub of Bayshore Networks reported this vulnerability to Rockwell Automation.
A controller in this fault state can be recovered by downloading a new project or an offline copy of the project to the controller. Rockwell Automation recommends users set the controller switch to RUN mode to prevent remote programming. Users are encouraged to have a backup copy of the project in the case it is necessary to recover from an event. Rockwell Automation also recommends users should consider migrating to the Micro870 controller.
Rockwell automation recommends the following general security guidelines:
Rockwell Automation users can refer to the Converged Plantwide Ethernet (CPwE) Design and Implementation Guide for best practices for deploying network segmentation and broader defense in depth strategies. Users can also refer to the Rockwell Automation System Security Design Guidelines on how to use Rockwell Automation products to improve the security of their industrial automation systems.
For more information see Rockwell Automationβs Security advisory (Login required).
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-2021-33012
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-21-189-01
cwe.mitre.org/data/definitions/20.html
literature.rockwellautomation.com/idc/groups/literature/documents/td/enet-td001_-en-p.pdf
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1132049
rockwellautomation.custhelp.com/app/answers/answer_view/a_id/494865
rockwellautomation.custhelp.com/app/answers/answer_view/a_id/898270
twitter.com/CISAgov
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us-cert.cisa.gov/ics
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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
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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.instagram.com/cisagov
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
37.7%