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Cisco ASA DHCPv6 Relay DoS Vulnerability
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
A vulnerability in the DHCPv6 relay feature of Cisco ASA may lead to a denial of service.
Insight
Insight
A vulnerability in the DHCPv6 relay feature could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to insufficient validation of DHCPv6 packets. Cisco ASA Software is affected by this vulnerability only if the software is configured with the DHCPv6 relay feature. An attacker could exploit this vulnerability by sending crafted DHCPv6 packets to an affected device. Only DHCPv6 packets directed to the Cisco ASA interface where the DHCPv6 relay feature is enabled can be used to trigger this vulnerability.
Affected Software
Affected Software
Version 9.0, 9.1, 9.2 and 9.3 on Cisco Adaptive Security Virtual Appliance (ASAv), Cisco ASA 1000V Cloud Firewall, Cisco ASA 5500 Series Adaptive Security Appliances, Cisco ASA 5500-X Series Next-Generation Firewalls and Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Apply the appropriate updates from Cisco. As a workaround disable the DHCPv6 relay feature.