{"cve_id":"CVE-2021-22681","published":"2021-03-03T18:15:14.643000+00:00","last_modified":"2026-06-17T03:37:34.183000+00:00","vuln_status":"Analyzed","description":"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.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":9.8,"base_severity":"CRITICAL","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-522"],"in_kev":true,"kev_date_added":"2026-03-05","kev_ransomware":false,"epss_score":0.6363,"epss_percentile":0.99216,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["CODE_EXEC","CRED_ACCESS","INFO_DISCLOSURE"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T09:34:18.848181+00:00","first_seen":"2021-03-03T18:15:14.643000+00:00","kev_first_seen":"2026-03-05T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["rockwellautomation"],"products":["compact_guardlogix_5370","compact_guardlogix_5380","compactlogix_1768","compactlogix_1769","compactlogix_5370","compactlogix_5380","compactlogix_5480","controllogix_5550","controllogix_5560","controllogix_5570","controllogix_5580","drivelogix_1794-l34","drivelogix_5560","drivelogix_5730","factorytalk_services_platform","guardlogix_5570","guardlogix_5580","rslogix_5000","softlogix_5800","studio_5000_logix_designer"],"affected":[{"vendor":"rockwellautomation","product":"factorytalk_services_platform","ranges":["≥ 2.10"]},{"vendor":"rockwellautomation","product":"rslogix_5000","ranges":["≥ 16 and ≤ 20"]},{"vendor":"rockwellautomation","product":"studio_5000_logix_designer","ranges":["≥ 21.0"]}]}