{"schemaVersion":3,"id":"CVE-2026-73451","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior.\n\nThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.","dates":{"published":"2026-09-15T18:12:44.908Z","modified":"2026-09-15T19:24:42.924Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.3,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00229,"percentile":0.12968,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.051999999999999984,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00177},"history":[{"date":"2026-09-16T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00229,"percentile":0.12968}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00177,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00229,"percentile":0.12968}]},"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":[],"exploitCount":0,"weaknesses":[{"id":"CWE-1419","name":"Incorrect Initialization of Resource","description":"The product attempts to initialize a resource but does not correctly do so, which might leave the resource in an unexpected, incorrect, or insecure state when it is accessed.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/1419.html"}],"affected":[{"vendor":"arista networks","product":"eos","name":"EOS","label":"eos","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.36.0, ≤ 4.36.0.1F","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.35.0, ≤ 4.35.4M","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.34.0, ≤ 4.34.6M","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.33.0, ≤ 4.33.8M","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.32.0, ≤ 4.32.11M","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.31.1F, ≤ 4.31.10M","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.36.0, ≤ 4.36.0.1F | ≥ 4.35.0, ≤ 4.35.4M | ≥ 4.34.0, ≤ 4.34.6M | ≥ 4.33.0, ≤ 4.33.8M | ≥ 4.32.0, ≤ 4.32.11M | ≥ 4.31.1F, ≤ 4.31.10M","eol":null,"hubHref":"/vendor/arista_networks/eos"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24707-security-advisory-0151","label":"www.arista.com/en/support/advisories-notices/security-advisory/24707-security-advisory-0151","hostname":"www.arista.com","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-15T18:12:44.908Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-15T19:24:42.924Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":25,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T14:03:35.657Z","stale":false,"partial":false}}