CASCACascade Atlas

Evidence dossier

CVE-2021-22681

CVE-2021-22681

68.8–89.6Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Mar 3, 2021
Updated
Mar 6, 2026
Evidence coverage
72%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS25.45%

2026-07-18 · v2026.06.15 · percentile 97.7%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

icscertoriginal assertion
container

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.

CISA KEVoriginal assertion
observed_exploitation

Rockwell Multiple Products Insufficient Protected Credentials Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.254550000000; percentile 0.977170000000

Applicability

Cited product scope

Trace impact →
n/aRockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers
[{"status": "affected", "version": "RSLogix 5000 Versions 16 through 20"}, {"status": "affected", "version": "Studio 5000 Logix Designer: Versions 21 and later"}, {"status": "affected", "version": "CompactLogix 1768, 1769, 5370, 5380, 5480"}, {"status": "affected", "version": "ControlLogix 5550, 5560, 5570, 5580"}, {"status": "affected", "version": "DriveLogix 5560, 5730, 1794-L34"}, {"status": "affected", "version": "Compact GuardLogix 5370, 5380"}, {"status": "affected", "version": "GuardLogix 5570, 5580"}, {"status": "affected", "version": "SoftLogix 5800"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:rockwellautomation:factorytalk_services_platform:*:*:*:*:*:*:*:*; start including 2.10supported
Unknown vendorUnknown product
cpe:2.3:a:rockwellautomation:rslogix_5000:*:*:*:*:*:*:*:*; start including 16; end including 20supported
Unknown vendorUnknown product
cpe:2.3:a:rockwellautomation:studio_5000_logix_designer:*:*:*:*:*:*:*:*; start including 21.0supported
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:compact_guardlogix_5370:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:compact_guardlogix_5380:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:compactlogix_1768:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:compactlogix_1769:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:compactlogix_5370:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:compactlogix_5380:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:compactlogix_5480:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:controllogix_5550:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:controllogix_5560:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:controllogix_5570:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:controllogix_5580:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:drivelogix_1794-l34:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:drivelogix_5560:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:drivelogix_5730:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:guardlogix_5570:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:guardlogix_5580:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:rockwellautomation:softlogix_5800:-:*:*:*:*:*:*:*constrained

Assessments

CVSS by origin

9.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.