CVE-2020-6998

Rockwell Automation CompactLogix 5370 and ControlLogix 5570 Controllers Improper Input Validation

HIGH
8.6
CVSS Score
Published: July 27, 2022 at 08:18 PM UTC
Updated: June 17, 2026 at 03:24 AM UTC
19 products affected across 1 vendorGuardlogix 5580 FirmwareCompactlogix 5370 L3 FirmwareCompact Guardlogix 5370 Firmware

Using Armor Compact GuardLogix 5370 controllers by Rockwell Automation?

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Severity
HIGH8.6
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 33v ≤ versions 33 and prior
rockwellautomation-armor-compact-guardlogix-5370 (same device)
v ≤ 33
rockwellautomation-compact-guardlogix-5370 (same device)
v ≤ 33v ≤ versions 33 and prior
rockwellautomation-compactlogix-5370-l1 (same device)
v ≤ 33v ≤ versions 33 and prior
rockwellautomation-compactlogix-5370-l2 (same device)
v ≤ 33v ≤ versions 33 and prior
rockwellautomation-compactlogix-5370-l3 (same device)
v ≤ 33
rockwellautomation-controllogix-5570 (same device)
v ≤ 33
rockwellautomation-guardlogix-5560 (same device)
v ≤ 33
rockwellautomation-guardlogix-5570 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

x_refsource_CONFIRMThird Party AdvisoryUS Government Resource
https://www.cisa.gov/uscert/ics/advisories/icsa-21-061-02

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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