CVE-2024-20303 Denial of service in Cisco IOS XE Software

High 7.4 Published 27 Mar 2024 Updated 1 Aug 2024

An unauthenticated adjacent attacker can cause a denial of service on Cisco IOS XE Wireless LAN Controllers by sending malicious mDNS packets.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-20303?

CVE-2024-20303 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 27 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper management of mDNS client entries. An attacker could exploit this vulnerability by connecting to the wireless network and sending a continuous stream of specific mDNS packets. A successful exploit could allow the attacker to cause the wireless controller to have high CPU utilization, which could lead to access points (APs) losing their connection to the controller and result in a DoS condition.

Weakness: CWE-459

Which versions are affected by CVE-2024-20303?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2024-20303?

No fix has been published for CVE-2024-20303 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-2024-20303 being exploited?

There is no known exploitation of CVE-2024-20303 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-jfv4-r4r3-xx7w.