Cisco has extended its patch for a high-severity IPv6 denial-of-service vulnerability that was first addressed in 2016. The bug (CVE-2016-1409) is a vulnerability in the IPv6 packet processing functions of multiple Cisco products. An unauthenticated, remote attacker could cause an affected device to stop processing IPv6 traffic, leading to a DoS condition on the device. Older versions of various Huawei gear and Juniper Junos are also affected by the flaw.
Source: https://threatpost.com/cisco-extends-patch-ipv6-dos-vulnerability/148397/