CVE-2021-22659: Buffer Overflow
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.
Affected Software
Event History
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.