CVE-2020-3191: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software IPv6 DNS Denial of Service Vulnerability
A vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper length validation of a field in an IPv6 DNS packet. An attacker could exploit this vulnerability by sending a crafted DNS query over IPv6, which traverses the affected device. An exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. This vulnerability is specific to DNS over IPv6 traffic only.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2020-3191?
CVE-2020-3191 is a vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software.
What is the severity of CVE-2020-3191?
The severity of CVE-2020-3191 is high with a CVSS score of 8.6.
Which software versions are affected by CVE-2020-3191?
Cisco Adaptive Security Appliance (ASA) Software versions 9.6 to 9.12, and Firepower Threat Defense (FTD) Software versions 6.2.3 to 6.4.0 are affected by CVE-2020-3191.
What is the impact of CVE-2020-3191?
CVE-2020-3191 could allow an unauthenticated, remote attacker to cause the device to unexpectedly reload, resulting in a denial of service (DoS) condition.
How can I fix CVE-2020-3191?
Cisco has released software updates to address the vulnerability. Please refer to the Cisco Security Advisory for more information.