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Cisco ASA DHCPv6 Relay DoS Vulnerability

Information

Severity

Severity

Medium

Family

Family

CISCO

CVSSv2 Base

CVSSv2 Base

5.7

CVSSv2 Vector

CVSSv2 Vector

AV:A/AC:M/Au:N/C:N/I:N/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

6 years ago

Modified

Modified

3 years ago

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.

Common Vulnerabilities and Exposures (CVE)