{"id":"CVE-2021-22681","state":"PUBLISHED","title":"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 ","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.","publishedAt":"2021-03-03T17:59:43.000Z","updatedAt":"2026-03-06T05:01:20.925Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"icscert","products":["n/a Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers"],"affected":[{"vendor":"n/a","product":"Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers","versions":[{"version":"RSLogix 5000 Versions 16 through 20","status":"affected"},{"version":"Studio 5000 Logix Designer: Versions 21 and later","status":"affected"},{"version":"CompactLogix 1768, 1769, 5370, 5380, 5480","status":"affected"},{"version":"ControlLogix 5550, 5560, 5570, 5580","status":"affected"},{"version":"DriveLogix 5560, 5730, 1794-L34","status":"affected"},{"version":"Compact GuardLogix 5370, 5380","status":"affected"},{"version":"GuardLogix 5570, 5580","status":"affected"},{"version":"SoftLogix 5800","status":"affected"}]}],"references":["https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22681"],"weaknesses":["CWE-522"],"ingestedAt":"2026-10-29T19:48:02.192Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/22xxx/CVE-2021-22681.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-22681","state":"PUBLISHED","datePublished":"2021-03-03T17:59:43.000Z","dateUpdated":"2026-03-06T05:01:20.925Z","assignerShortName":"icscert","assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateReserved":"2021-01-05T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers","versions":[{"version":"RSLogix 5000 Versions 16 through 20","status":"affected"},{"version":"Studio 5000 Logix Designer: Versions 21 and later","status":"affected"},{"version":"CompactLogix 1768, 1769, 5370, 5380, 5480","status":"affected"},{"version":"ControlLogix 5550, 5560, 5570, 5580","status":"affected"},{"version":"DriveLogix 5560, 5730, 1794-L34","status":"affected"},{"version":"Compact GuardLogix 5370, 5380","status":"affected"},{"version":"GuardLogix 5570, 5580","status":"affected"},{"version":"SoftLogix 5800","status":"affected"}]}],"references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-522","description":"Insufficiently Protected Credentials CWE-522","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"icscert","dateUpdated":"2021-03-03T17:59:43.000Z","orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"ics-cert@hq.dhs.gov","ID":"CVE-2021-22681","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Rockwell Automation Studio 5000 Logix Designer, RSLogix 5000, Logix Controllers","version":{"version_data":[{"version_value":"RSLogix 5000 Versions 16 through 20"},{"version_value":"Studio 5000 Logix Designer: Versions 21 and later"},{"version_value":"CompactLogix 1768, 1769, 5370, 5380, 5480"},{"version_value":"ControlLogix 5550, 5560, 5570, 5580"},{"version_value":"DriveLogix 5560, 5730, 1794-L34"},{"version_value":"Compact GuardLogix 5370, 5380"},{"version_value":"GuardLogix 5570, 5580"},{"version_value":"SoftLogix 5800"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Insufficiently Protected Credentials CWE-522"}]}]},"references":{"reference_data":[{"name":"https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03","refsource":"MISC","url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-056-03","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T18:51:06.940Z"}},{"title":"CISA ADP Vulnrichment","references":[{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22681","tags":["government-resource"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-03-05T00:00:00+00:00","options":[{"Exploitation":"active"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2021-22681"}}},{"other":{"type":"kev","content":{"dateAdded":"2026-03-05","reference":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22681"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-06T05:01:20.925Z"},"timeline":[{"time":"2026-03-05T00:00:00.000Z","lang":"en","value":"CVE-2021-22681 added to CISA KEV"}]}]}}}