{"cve":"CVE-2020-6998","nvd":{"published":"2022-07-27T21:15:08.297","modified":"2026-06-17T03:24:05.747","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","score":8.6},"cwes":["CWE-20"],"references":["https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1130398","https://www.cisa.gov/uscert/ics/advisories/icsa-21-061-02","https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1130398","https://www.cisa.gov/uscert/ics/advisories/icsa-21-061-02"],"products":["rockwellautomation:armor_compact_guardlogix_5370_firmware","rockwellautomation:compact_guardlogix_5370_firmware","rockwellautomation:compactlogix_5370_l1_firmware","rockwellautomation:compactlogix_5370_l2_firmware","rockwellautomation:compactlogix_5370_l3_firmware","rockwellautomation:controllogix_5570_firmware","rockwellautomation:guardlogix_5560_firmware","rockwellautomation:guardlogix_5570_firmware","rockwellautomation:guardlogix_5580_firmware"],"source":"nvd","synced_at":"2026-10-19T21:33:44.859608815+00:00"},"epss":{"cve":"CVE-2020-6998","score":0.0316,"percentile":0.87984,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}