CVE-2020-3221 Cisco IOS XE Software Flexible NetFlow Version 9 Denial of Service Vulnerability

High 8.6 Published 3 Jun 2020 Updated 15 Nov 2024

Remote attackers can cause a device reload by sending malformed Flexible NetFlow packets to Cisco Catalyst 9800 Wireless Controllers.

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-2020-3221?

CVE-2020-3221 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 3 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Flexible NetFlow Version 9 packet processor of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of parameters in a Flexible NetFlow Version 9 record. An attacker could exploit this vulnerability by sending a malformed Flexible NetFlow Version 9 packet to the Control and Provisioning of Wireless Access Points (CAPWAP) data port of an affected device. An exploit could allow the attacker to trigger an infinite loop, resulting in a process crash that would cause a reload of the device.

Weakness: CWE-20

Which versions are affected by CVE-2020-3221?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2020-3221?

No fix has been published for CVE-2020-3221 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-2020-3221 being exploited?

There is no known exploitation of CVE-2020-3221 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-q65h-8wrc-fm43.