{"id":"CVE-2026-73458","title":"On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down","summary":"On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes …","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cwe":["CWE-303"],"vendor":"Arista Networks","product":"EOS","affected":["EOS >= 4.36.0 <= 4.36.1F","EOS >= 4.35.0 <= 4.35.5M","EOS >= 4.34.0 <= 4.34.7M","EOS >= 4.33.0 <= 4.33.8M"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:08:50.420","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73458","references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24710-security-advisory-0154","label":"psirt@arista.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-15T19:38:30.537124Z"},"ingestedAt":"2026-09-15T19:42:58.813Z","epss":0.00383,"epssPercentile":0.32142,"slug":"CVE-2026-73458","body":"## Overview\n\nOn affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}