Cisco OpenDNS Pulsing DNS Denial of Service Attack

Cisco Security Advisory

The Cisco OpenDNS service was susceptible to a DNS pulsing attack due to improper handling if a large volume of queued DNS requests was received. This attack takes advantage of multiple commonly implemented DNS mechanisms. DNS queries are sent at a low rate and amplified into large-sized responses. This concentrates the DNS responses into a short, high-volume burst to overwhelm target systems.

Security Impact Rating: Informational

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