MajorCritical vulnerability
CVE-2026-121290 (CVSS 8.3)
NVD · officialPublished Nov 10, 2026Risk 37/100
On affected platforms running Arista EOS with Border Gateway Protocol (BGP) changing the BGP listen port from its default value disables default protective Access Control List (ACL) rules against unexpected BGP peering attempts.
Technical details
CVSS
8.3
AV:NetworkAC:LowPR:NoneUI:None
Evidence and sources
This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.
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