Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rockwellautomation | Micrologix 1400 Firmware | <= 21.6 |
| Rockwellautomation | Micrologix 1400 | - |
Related Weaknesses (CWE)
References
- https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/locPermissions RequiredVendor Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01Third Party AdvisoryUS Government Resource
- https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/locPermissions RequiredVendor Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01Third Party AdvisoryUS Government Resource
FAQ
What is CVE-2021-22659?
CVE-2021-22659 is a vulnerability with a CVSS score of 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 valu...
How severe is CVE-2021-22659?
CVE-2021-22659 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-22659?
Check the references section above for vendor advisories and patch information. Affected products include: Rockwellautomation Micrologix 1400 Firmware, Rockwellautomation Micrologix 1400.