CVE-2021-34768 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Denial of Service Vulnerabilities

High 8.6 Published 23 Sep 2021 Updated 7 Nov 2024

Unauthenticated remote attackers can cause denial of service on Cisco Catalyst 9000 Wireless Controllers by sending malformed CAPWAP 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-2021-34768?

CVE-2021-34768 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 23 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Multiple vulnerabilities in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. These vulnerabilities are due to insufficient validation of CAPWAP packets. An attacker could exploit the vulnerabilities by sending a malformed CAPWAP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to crash and reload, resulting in a DoS condition.

Weakness: CWE-415

Which versions are affected by CVE-2021-34768?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2021-34768?

No fix has been published for CVE-2021-34768 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-2021-34768 being exploited?

There is no known exploitation of CVE-2021-34768 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-7pcr-5h9h-38rf.