Cisco Systems and Palo Alto Networks have fixed similar high-risk authentication bypass vulnerabilities in their network security devices that were caused by an oversight in the implementation of the Kerberos protocol. Man-in-the-middle (MitM) attackers could exploit these weaknesses to get administrative control over the appliances. [ Keep up with 8 hot cyber security trends (and 4 going cold) .
Source : Cisco and Palo Alto Networks appliances impacted by Kerberos authentication bypass