What is CVE-2021-22659?

CVE-2021-22659 is a vulnerability in Rockwell Automation MicroLogix 1400 Version 21.6 and below that allows a remote unauthenticated attacker to retrieve or modify random values in the register.

What is the severity of CVE-2021-22659?

The severity of CVE-2021-22659 is high with a severity value of 8.6.

How can an attacker exploit CVE-2021-22659?

An attacker can exploit CVE-2021-22659 by sending a specially crafted Modbus packet to the vulnerable device.

What is the impact of successfully exploiting CVE-2021-22659?

Successfully exploiting CVE-2021-22659 may lead to a buffer overflow, resulting in a denial-of-service condition.

How can I fix CVE-2021-22659?

To fix CVE-2021-22659, Rockwell Automation advises upgrading to a version of MicroLogix 1400 firmware that is higher than 21.6.

Vulnerability/
CVE-2021-22659

high

8.6

CWE

120 119

25/3/2021

3/8/2024

CVE-2021-22659: Buffer Overflow

First published: Thu Mar 25 2021(Updated: )

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.

Credit: ics-cert@hq.dhs.gov

Affected Software	Affected Version	How to fix
Rockwellautomation Micrologix 1400 Firmware	<=21.6
Rockwellautomation Micrologix 1400

Never miss a vulnerability like this again

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

ICSA-21-033-01

Frequently Asked Questions

What is CVE-2021-22659?
CVE-2021-22659 is a vulnerability in Rockwell Automation MicroLogix 1400 Version 21.6 and below that allows a remote unauthenticated attacker to retrieve or modify random values in the register.
What is the severity of CVE-2021-22659?
The severity of CVE-2021-22659 is high with a severity value of 8.6.
How can an attacker exploit CVE-2021-22659?
An attacker can exploit CVE-2021-22659 by sending a specially crafted Modbus packet to the vulnerable device.
What is the impact of successfully exploiting CVE-2021-22659?
Successfully exploiting CVE-2021-22659 may lead to a buffer overflow, resulting in a denial-of-service condition.
How can I fix CVE-2021-22659?
To fix CVE-2021-22659, Rockwell Automation advises upgrading to a version of MicroLogix 1400 firmware that is higher than 21.6.

collector/nvd-index
agent/references
agent/type
agent/softwarecombine
collector/mitre-cve
source/MITRE
agent/weakness
agent/severity
agent/author
agent/last-modified-date
agent/tags
agent/description
agent/first-publish-date
agent/event
collector/ics-cert-advisory
source/ICS
vendor/rockwellautomation
canonical/rockwellautomation micrologix 1400 firmware
version/rockwellautomation micrologix 1400 firmware/21.6
canonical/rockwellautomation micrologix 1400

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.