CVE-2020-3359 Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers Multicast DNS Denial of Service Vulnerability

High 8.6 Published 24 Sep 2020 Updated 13 Nov 2024

Remote attackers can cause a denial of service on Cisco Catalyst 9800 wireless controllers by sending crafted multicast DNS 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-2020-3359?

CVE-2020-3359 is a high-severity denial of service vulnerability in Cisco Ios Xe, 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 the multicast DNS (mDNS) feature 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. The vulnerability is due to improper validation of mDNS packets. An attacker could exploit this vulnerability by sending a crafted mDNS packet to an affected device. A successful exploit could cause a device to reload, resulting in a DoS condition.

Weakness: CWE-20

Which versions are affected by CVE-2020-3359?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2020-3359?

No fix has been published for CVE-2020-3359 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-2020-3359 being exploited?

There is no known exploitation of CVE-2020-3359 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-vmh3-rhm9-223f.