CVE-2020-3559 Cisco Aironet Access Point Authentication Flood Denial of Service Vulnerability

Medium 6.8 Published 24 Sep 2020 Updated 13 Nov 2024

An unauthenticated remote attacker can cause a Cisco Aironet Access Point to reload by sending excessive authentication requests.

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-2020-3559?

CVE-2020-3559 is a medium-severity denial of service vulnerability in Cisco Aironet Access Point Software, published on 24 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in Cisco Aironet Access Point (AP) Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper handling of clients that are trying to connect to the AP. An attacker could exploit this vulnerability by sending authentication requests from multiple clients to an affected device. A successful exploit could allow the attacker to cause the affected device to reload.

Weakness: CWE-400

Which versions are affected by CVE-2020-3559?

It affects 4 products.

Products include Cisco Access Points, Cisco Aironet Access Point Software, Cisco Business Access Points, Cisco Wireless Lan Controller.

How do I fix CVE-2020-3559?

No fix has been published for CVE-2020-3559 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-2020-3559 being exploited?

There is no known exploitation of CVE-2020-3559 in the wild and no public exploit code.

Sources

Also known as GHSA-mmvp-2hg2-g76c.