CVE-2024-20434 Denial of service in Cisco IOS XE Software
An unauthenticated adjacent attacker can cause a denial of service on the control plane of Cisco IOS XE devices by sending crafted VLAN-tagged frames.
- 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-2024-20434?
CVE-2024-20434 is a medium-severity denial of service vulnerability in Cisco Ios Xe, published on 25 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on the control plane of an affected device. This vulnerability is due to improper handling of frames with VLAN tag information. An attacker could exploit this vulnerability by sending crafted frames to an affected device. A successful exploit could allow the attacker to render the control plane of the affected device unresponsive. The device would not be accessible through the console or CLI, and it would not respond to ping requests, SNMP requests, or requests from other control plane protocols. Traffic that is traversing the device through the data plane is not affected. A reload of the device is required to restore control plane services.
Weakness: CWE-190
Which versions are affected by CVE-2024-20434?
It affects 1 product.
Products include Cisco Ios Xe.
How do I fix CVE-2024-20434?
No fix has been published for CVE-2024-20434 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-2024-20434 being exploited?
There is no known exploitation of CVE-2024-20434 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xe
- CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation
- CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution
- CVE-2023-20273 Cisco IOS XE Web UI Command Injection
- CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software
- CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability
Sources
Also known as GHSA-4g2v-4q6g-26v9.