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Vulnerability record · CVE-2020-6998 · published 27 July 2022

CVE-2020-6998: Rockwellautomation armor compact guardlogix 5370 firmware improper input validation vulnerability

Rockwellautomation · Armor Compact Guardlogix 5370 Firmware

The connection establishment algorithm found in Rockwell Automation CompactLogix 5370 and ControlLogix 5570 versions 33 and prior does not sufficiently manage its control flow during execution, creating an infinite loop. This may allow an attacker to send specially crafted CIP packet requests to a controller, which may cause denial-of-service conditions in communications with other products.

8.6 CVSS 3.1 High EPSS 2.3% · top 17.6% CWE-20 · Improper input validation
8.6CVSS 3.1 base score
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

The connection establishment algorithm found in Rockwell Automation CompactLogix 5370 and ControlLogix 5570 versions 33 and prior does not sufficiently manage its control flow during execution, creating an infinite loop. This may allow an attacker to send specially crafted CIP packet requests to a controller, which may cause denial-of-service conditions in communications with other products.

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

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1130398 Permissions RequiredVendor Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-061-02 Third Party AdvisoryUS Government Resource
https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1130398 Permissions RequiredVendor Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-061-02 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-6998), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.