What’s Vulnerable › Vulnerabilities

CVE-2020-6998: Rockwell Automation CompactLogix 5370 and ControlLogix 5570 Controllers Improper Input Validation

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-07-27 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Rockwellautomation Armor Compact Guardlogix 5370 Firmware: through 33
• Rockwellautomation Compact Guardlogix 5370 Firmware: through 33
• Rockwellautomation Compactlogix 5370 L1 Firmware: through 33
• Rockwellautomation Compactlogix 5370 L2 Firmware: through 33
• Rockwellautomation Compactlogix 5370 L3 Firmware: through 33
• Rockwellautomation Controllogix 5570 Firmware: through 33
• Rockwellautomation Guardlogix 5560 Firmware: through 33
• Rockwellautomation Guardlogix 5570 Firmware: through 33
• Rockwellautomation Guardlogix 5580 Firmware: through 33

References

• https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1130398
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-061-02
• https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1130398
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-061-02

Get alerted when CVE-2020-6998 or the next vulnerability affects your stack