{"cve":{"cve_id":"CVE-2021-28505","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":0.00844,"epss_percentile":0.53174,"epss_as_of":"2026-06-23","description":"On affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol.","published_at":"2022-04-14T20:05:50.059000Z","last_modified_at":null,"cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","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-284"],"nvd_references":["https://www.arista.com/en/support/advisories-notices/security-advisories/15267-security-advisory-0073"],"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":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"arista-networks","vendor_name":"Arista Networks","product_slug":"eos","product_name":"EOS","version_start":"4.26.3M","version_start_inclusive":true,"version_end":"4.26.0","version_end_inclusive":true,"cpe23_uri":"cve5:arista-networks:eos:4.26.3M:4.26.0"},{"vendor_slug":"arista-networks","vendor_name":"Arista Networks","product_slug":"eos","product_name":"EOS","version_start":"4.27.0F","version_start_inclusive":true,"version_end":"4.27.0","version_end_inclusive":true,"cpe23_uri":"cve5:arista-networks:eos:4.27.0F:4.27.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/15267-security-advisory-0073","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2022-04-14T20:05:50.059000Z","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"}]}