Cisco has extended its patch for a high-severity IPv6 denial-of-service (DoS) 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, which could allow an unauthenticated, remote attacker to cause an affected device to stop processing IPv6 traffic, leading to a denial of service (DoS) condition on the device.

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