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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-03-05
• EPSS: 63.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-03 · updated 2026-06-17
• Weakness: CWE-522

Description

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

• Rockwell Automation FactoryTalk Services Platform: from 2.10
• Rockwellautomation Rslogix 5000: from 16 through 20
• Rockwell Automation Studio 5000 Logix Designer: from 21.0

References

• https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03
• https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22681

Get alerted when CVE-2021-22681 or the next vulnerability affects your stack