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Cisco Catalyst 9000 Series Switches

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high advisory

Cisco IOS XE DHCP Snooping BOOTP VLAN Leakage DoS (CVE-2026-20084)

CVE-2026-20084 describes a vulnerability in Cisco IOS XE DHCP snooping where an unauthenticated remote attacker can cause a denial-of-service by forwarding BOOTP packets between VLANs, leading to high CPU utilization on affected Cisco Catalyst 9000 Series Switches.

Cisco IOS XE Software +1 cve-2026-20084 dhcp-snooping bootp denial-of-service cisco
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