CVE-2021-22681
Rockwell Multiple Products Insufficient Protected Credentials Vulnerability
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 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.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Deadline for federal agencies: 2026-03-26.
6 articles across 6 outlets · first covered Aug 2, 2026 · latest Aug 2, 2026
Coverage timeline
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Rockwell PLC CVE-2021-22681 exploited in the wild, risk to plantswww.securityweek.com · Mar 6, 2026
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KEV adds CVE-2017-7921 and CVE-2021-22681 patch due by 26 Marsocradar.io · Mar 6, 2026
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CISA Adds CVEs to KEV for Apple Rockwell and Hikvision Flawssecurityaffairs.com · Mar 6, 2026
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CISA flags CVE-2017-7921 CVE-2021-22681 amid Hikvision exploitsthehackernews.com · Mar 6, 2026
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Rockwell CVE-2021-22681 risks unauthorised Logix accesswww.cisa.gov · Mar 5, 2026
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Rockwell CVE-2021-22681: Active exploit targets Logix systemscisa.gov · Mar 5, 2026