CVE-2021-22659

HighCVSS 8.6/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 8.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Weakness enumeration

CWE-120

Affected software

Vendor	Product	Versions
n/a	Rockwell Automation MicroLogix 1400	MicroLogix 1400, All series Version 21.6 and below

References

https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlightPermissions Required, Vendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01Third Party Advisory, US Government Resource
https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlightPermissions Required, Vendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01Third Party Advisory, US Government Resource

Timeline

Published: Mar 25, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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