Home/CVE/The connection establishment algorithm found in Rockwell Automation CompactLogix 5370 and ControlLogix 5570 versions 33
CVE

CVE-2020-6998

The connection establishment algorithm found in Rockwell Automation CompactLogix 5370 and ControlLogix 5570 versions 33

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.

MEDIUM · CVSS 5.8 EPSS 0.0028
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
CWE-20Improper Input Validation
▤

Affected Products & Versions

9
rockwellautomation armor compact guardlogix 5370 firmware<= 33
rockwellautomation compact guardlogix 5370 firmware<= 33
rockwellautomation compactlogix 5370 l1 firmware<= 33
rockwellautomation compactlogix 5370 l2 firmware<= 33
rockwellautomation compactlogix 5370 l3 firmware<= 33
rockwellautomation controllogix 5570 firmware<= 33
rockwellautomation guardlogix 5560 firmware<= 33
rockwellautomation guardlogix 5570 firmware<= 33
▣

Scoring & Timeline

5.8
MEDIUM · CVSS v3.1 · ics-cert@hq.dhs.gov
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Jul 2022 · 09:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisa-csafcisa-csaf-csaf_files-OT-white-2021-icsa-21-061-02
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1130398Permissions RequiredVendor Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-061-02Third Party AdvisoryUS Government Resource
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