CVE-2021-22659
Last modified
CVE-2021-22659 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. EPSS estimates a 1.72% chance of exploitation in the next 30 days.
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/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Rockwellautomation | Micrologix 1400 Firmware | <= 21.6 |
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
- Last Modified
- Status
- Modified
Frequently Asked Questions
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