CVE-2021-22681: Rockwell Multiple Products Insufficient Protected Credentials Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2026-03-05. EPSS: 63.6% chance of exploitation in the next 30 days.

Rockwell Automation Studio 5000 Logix Designer Versions 21 and later, and RSLogix 5000 Versions 16 through 20 use a key to verify Logix controllers are communicating with Rockwell Automation CompactLogix 1768, 1769, 5370, 5380, 5480: ControlLogix 5550, 5560, 5570, 5580; DriveLogix 5560, 5730, 1794-L34; Compact GuardLogix 5370, 5380; GuardLogix 5570, 5580; SoftLogix 5800. Rockwell Automation Studio 5000 Logix Designer Versions 21 and later and RSLogix 5000: Versions 16 through 20 are vulnerable because an unauthenticated attacker could bypass this verification mechanism and authenticate with Rockwell Automation CompactLogix 1768, 1769, 5370, 5380, 5480: ControlLogix 5550, 5560, 5570, 5580; DriveLogix 5560, 5730, 1794-L34; Compact GuardLogix 5370, 5380; GuardLogix 5570, 5580; SoftLogix 5800.

Affected products

• Rockwellautomation Factorytalk Services Platform: from 2.10
• Rockwellautomation Rslogix 5000: from 16, up to and including 20
• Rockwellautomation Studio 5000 Logix Designer: from 21.0

Published 2021-03-03. Last modified 2026-06-17.