{"cve":{"cve_id":"CVE-2021-28495","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.009,"epss_percentile":0.54963,"epss_as_of":"2026-06-23","description":"In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, user authentication can be bypassed when API access is enabled via the JSON-RPC APIs. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.13 and post releases in the MOS-0.1x train MOS-0.26.6 and below releases in the MOS-0.2x train MOS-0.31.1 and below releases in the MOS-0.3x train","published_at":"2021-09-09T12:43:57Z","last_modified_at":null,"cvss_v3_score":7.2,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-287"],"nvd_references":["https://www.arista.com/en/support/advisories-notices/security-advisories/12914-security-advisory-66"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:15:25.251935Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"arista","vendor_name":"Arista","product_slug":"metamako-operating-system","product_name":"Metamako Operating System","version_start":"MOS-0.13","version_start_inclusive":true,"version_end":"MOS-0.13*","version_end_inclusive":false,"cpe23_uri":"cve5:arista:metamako-operating-system:MOS-0.13:MOS-0.13*"},{"vendor_slug":"arista","vendor_name":"Arista","product_slug":"metamako-operating-system","product_name":"Metamako Operating System","version_start":"MOS-0.26.7","version_start_inclusive":true,"version_end":"MOS-0.26.7","version_end_inclusive":false,"cpe23_uri":"cve5:arista:metamako-operating-system:MOS-0.26.7:MOS-0.26.7"},{"vendor_slug":"arista","vendor_name":"Arista","product_slug":"metamako-operating-system","product_name":"Metamako Operating System","version_start":"MOS-0.32.0","version_start_inclusive":true,"version_end":"MOS-0.32.0","version_end_inclusive":false,"cpe23_uri":"cve5:arista:metamako-operating-system:MOS-0.32.0:MOS-0.32.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/12914-security-advisory-66","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2021-09-09T12:43:57Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:17:54.413810Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:17:54.413810Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:17:54.413810Z","label":"CVSS score revised","source":"cvelistv5"}]}