{"schemaVersion":3,"id":"CVE-2021-28501","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.","dates":{"published":"2022-01-14T19:04:48.898Z","modified":"2024-09-17T03:43:50.014Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.1,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":6.9,"severity":"medium","vector":"AV:L/AC:M/Au:N/C:C/I:C/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00844,"percentile":0.57304,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00844},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00844,"percentile":0.57304}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00844,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00844,"percentile":0.57304}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_F992742525FD11DA","name":"Exploit Reference (arista.com)","source":"reference","url":"https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-285","name":"Improper Authorization","description":"The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/285.html"}],"affected":[{"vendor":"arista networks","product":"terminattr","name":"Terminattr","label":"terminattr","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"1.16.2 0","noFixRecorded":false,"fixedIn":null}],"versionsText":"1.16.2 0","eol":null,"hubHref":"/vendor/arista_networks/terminattr"},{"vendor":"arista","product":"terminattr","name":"terminattr","label":"terminattr","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 1.16.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 1.16.2","eol":null,"hubHref":"/vendor/arista/terminattr"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071","label":"www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071","hostname":"www.arista.com","tags":["X Refsource MISC","Exploit","Mitigation","Patch","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2022-01-14T19:04:48.898Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-09-17T03:43:50.014Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T03:58:16.061Z","stale":false,"partial":false}}