CVE-2020-3306 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software DHCP Denial of Service Vulnerability

Medium 6.8 Published 6 May 2020 Updated 15 Nov 2024

Unauthenticated remote attackers can cause a denial of service on Cisco ASA and FTD devices by sending crafted DHCP packets.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-3306?

CVE-2020-3306 is a medium-severity denial of service vulnerability in Cisco Adaptive Security Appliance, published on 6 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the DHCP module of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the affected device. The vulnerability is due to incorrect processing of certain DHCP packets. An attacker could exploit this vulnerability by sending a crafted DHCP packet to the affected device. A successful exploit could allow the attacker to cause a DoS condition on the affected device.

Weakness: CWE-400

Which versions are affected by CVE-2020-3306?

It affects 3 products.

Products include Cisco Adaptive Security Appliance, Cisco Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense.

How do I fix CVE-2020-3306?

No fix has been published for CVE-2020-3306 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-3306 being exploited?

There is no known exploitation of CVE-2020-3306 in the wild and no public exploit code.

All Cisco Adaptive Security Appliance vulnerabilities

Sources

Also known as GHSA-9j23-r6hx-vww9.