CVE-2020-3510 Cisco IOS XE Software for Catalyst 9200 Series Switches Umbrella Connector 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 9200 switches by sending malicious DNS requests to the Umbrella Connector interface.

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-2020-3510?

CVE-2020-3510 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 Umbrella Connector component of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches could allow an unauthenticated, remote attacker to trigger a reload, resulting in a denial of service condition on an affected device. The vulnerability is due to insufficient error handling when parsing DNS requests. An attacker could exploit this vulnerability by sending a series of malicious DNS requests to an Umbrella Connector client interface of an affected device. A successful exploit could allow the attacker to cause a crash of the iosd process, which triggers a reload of the affected device.

Weakness: CWE-400, CWE-388

Which versions are affected by CVE-2020-3510?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2020-3510?

No fix has been published for CVE-2020-3510 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-2020-3510 being exploited?

There is no known exploitation of CVE-2020-3510 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-9f77-7fxg-mppm.