Cisco has released security updates addressing a critical vulnerability in the Switch Integrated Security Features (SISF) of multiple software platforms that could allow unauthenticated attackers to cause denial of service (DoS) conditions.
The vulnerability stems from incorrect handling of DHCPv6 packets and affects Cisco IOS Software, IOS XE Software, NX-OS Software, and Wireless LAN Controller (WLC) AireOS Software.
https://gbhackers.com/cisco-ios-softwar ... erability/