Cisco Nexus 9000 Series Fabric Switches in ACI Mode Endpoint Group Contract Bypass Vulnerability
Cisco Nexus 9000 ACI switches allow unauthenticated bypass of EPG contracts via DHCP UDP ports.
Cisco disclosed a vulnerability in endpoint group contract handling on Nexus 9000 Series Fabric Switches running in ACI mode. An unauthenticated remote attacker can bypass configured EPG contracts by sending IPv4 or IPv6 packets that use UDP source and destination ports assigned to DHCP. Cisco has released software updates, and the advisory states there are no workarounds.
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