CVE-2020-3200 Cisco IOS and IOS XE Software Secure Shell Denial of Service Vulnerability

High 7.7 Published 3 Jun 2020 Updated 15 Nov 2024

An authenticated remote attacker can cause a Cisco IOS device to reload by sending specific SSH traffic, resulting in a denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-3200?

CVE-2020-3200 is a high-severity denial of service vulnerability in Cisco Ios, published on 3 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability in the Secure Shell (SSH) server code of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload. The vulnerability is due to an internal state not being represented correctly in the SSH state machine, which leads to an unexpected behavior. An attacker could exploit this vulnerability by creating an SSH connection to an affected device and using a specific traffic pattern that causes an error condition within that connection. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Weakness: CWE-436, CWE-371

Which versions are affected by CVE-2020-3200?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2020-3200?

No fix has been published for CVE-2020-3200 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-2020-3200 being exploited?

There is no known exploitation of CVE-2020-3200 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-m29x-vp4p-2wvp.