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Cisco Nexus 3000 and 9000 Series Switches Border Gateway Protocol Denial of Service Vulnerability

lowcisco_psirtPublished 2026-05-20

<p>A vulnerability in the Border Gateway Protocol (BGP)&nbsp;<strong>enforce-first-as</strong> feature of<span class="ng-binding">&nbsp;Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode</span> could allow an unauthenticated, remote attacker to trigger BGP peer flaps, resulting in a denial of service (DoS) condition.</p> <p>This vulnerability is due to i

Indicators of compromise

Original source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bgp-iefab-3hb2pwtx?vs_f=Cisco%20Security%20Advisory%26vs_cat=Security%20Intelligence%26vs_type=RSS%26vs_p=Cisco%20Nexus%203000%20and%209000%20Series%20Switches%20Border%20Gateway%20Protocol%20Denial%20of%20Service%20Vulnerability%26vs_k=1