CVE-2021-22681Rockwell 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 CompactL…
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It affects rockwellautomation factorytalk_services_platform and 2 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 5, 2026; federal agencies had to remediate by Mar 26, 2026. Treat that date as your deadline.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-522
- Known exploited
- Added to CISA KEV Mar 5, 2026; federal remediation due Mar 26, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 63.63% (percentile 99)
- Assigned by
- icscert
- NVD analysis
- Analyzed
- Record last updated
- Mar 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
rockwellautomation factorytalk_services_platform rockwellautomation:factorytalk_services_platform | from 2.10 | NVD |
rockwellautomation rslogix_5000 rockwellautomation:rslogix_5000 | from 16 through 20 | NVD |
rockwellautomation studio_5000_logix_designer rockwellautomation:studio_5000_logix_designer | from 21.0 | NVD |
References
- https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03x-refsource-misc, third-party-advisory, us-government-resource
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22681us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.