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CVE-2021-22659

8.6 · HIGH

Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random v…

Published Mar 25, 2021CWE-120EPSS 1.73%

Overview

CVE-2021-22659 is a high-severity vulnerability. It was published on March 25, 2021 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refrockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlightCISAus-cert.cisa.gov/ics/advisories/icsa-21-033-01Refrockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlightCISAus-cert.cisa.gov/ics/advisories/icsa-21-033-01

How CyberStrike helps

Frequently asked questions

What is CVE-2021-22659?

CVE-2021-22659 is a high-severity vulnerability. It was published on March 25, 2021 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2021-22659?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-22659?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-22659?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-22659 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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