Cisco Security Advisory - A vulnerability in the implementation of the IP version 6 (IPv6) protocol stack in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause I/O memory depletion on an affected device that has IPv6 enabled. The vulnerability is triggered when an affected device processes a malformed IPv6 packet. Cisco has released free software updates that address this vulnerability. There are no workarounds to mitigate this vulnerability.
b099cd45ced8201a847dacf48fc924497fe7165c4d908be59deb34c1e012a531