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CVE-2020-6998

The connection establishment algorithm found in Rockwell Automation CompactLogix 5370 and ControlLogix 5570 versions 33 and prior does not sufficiently manage its control flow during execution, creating an infinite loop. This may allow an attacker to send specially crafted CIP packet requests to a controller, which may cause denial-of-service conditions in communications with other products.
5.8
CVSS
1.7
ShadowTrackr
NO
CISA KEV
-
NCSC.nl
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityUnreported
Vulnerable System
ConfidentialityNone
IntegrityNone
AvailabilityLow
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusUnavailable

Change Log
DateSourceChangesScore
2026-07-21cve.orginitial, patch: Unavailable1.7
References: CVE.org · NVD

Affected Software
VendorProductVersion
Rockwell AutomationArmor Compact GuardLogix 5370 controllers≤ versions 33 and prior
Rockwell AutomationArmor GuardLogix Safety Controllers≤ versions 33 and prior
Rockwell AutomationCompact GuardLogix 5370 controllers≤ versions 33 and prior
Rockwell AutomationCompactLogix 5370 L1 controllers≤ versions 33 and prior
Rockwell AutomationCompactLogix 5370 L2 controllers≤ versions 33 and prior
Rockwell AutomationCompactLogix 5370 L3 controllers≤ versions 33 and prior
Rockwell AutomationControlLogix 5570 controllers≤ versions 33 and prior
rockwellautomationarmor_compact_guardlogix_5370_firmware≤ 33
rockwellautomationcompact_guardlogix_5370_firmware≤ 33
rockwellautomationcompactlogix_5370_l1_firmware≤ 33
rockwellautomationcompactlogix_5370_l2_firmware≤ 33
rockwellautomationcompactlogix_5370_l3_firmware≤ 33
rockwellautomationcontrollogix_5570_firmware≤ 33
rockwellautomationguardlogix_5560_firmware≤ 33
rockwellautomationguardlogix_5570_firmware≤ 33
rockwellautomationguardlogix_5580_firmware≤ 33
Published: 2022-07-27