CVE-2024-20309 Denial of service in Cisco IOS XE Software

Medium 5.6 Published 27 Mar 2024 Updated 9 Aug 2024

An authenticated local attacker can cause a denial of service on Cisco IOS XE devices by sending specific data to the AUX port when flow control is enabled.

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

What is CVE-2024-20309?

CVE-2024-20309 is a medium-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 auxiliary asynchronous port (AUX) functions of Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload or stop responding. This vulnerability is due to the incorrect handling of specific ingress traffic when flow control hardware is enabled on the AUX port. An attacker could exploit this vulnerability by reverse telnetting to the AUX port and sending specific data after connecting. A successful exploit could allow the attacker to cause the device to reset or stop responding, resulting in a denial of service (DoS) condition.

Weakness: CWE-828

Which versions are affected by CVE-2024-20309?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2024-20309?

No fix has been published for CVE-2024-20309 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-2024-20309 being exploited?

There is no known exploitation of CVE-2024-20309 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-p2c3-pjg6-q385.