CVE-2020-3203 Cisco IOS XE Software Catalyst 9800 Series Wireless Controllers Denial of Service Vulnerability

High 8.6 Published 3 Jun 2020 Updated 15 Nov 2024

Unauthenticated remote attackers can cause a denial of service on Cisco Catalyst 9800 wireless controllers by sending crafted SSL packets that trigger a memory leak.

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-2020-3203?

CVE-2020-3203 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 3 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the locally significant certificate (LSC) provisioning feature of Cisco Catalyst 9800 Series Wireless Controllers that are running Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a memory leak that could lead to a denial of service (DoS) condition. The vulnerability is due to incorrect processing of certain public key infrastructure (PKI) packets. An attacker could exploit this vulnerability by sending crafted Secure Sockets Layer (SSL) packets to an affected device. A successful exploit could cause an affected device to continuously consume memory, which could result in a memory allocation failure that leads to a crash and causes a DoS condition.

Weakness: CWE-401, CWE-400

Which versions are affected by CVE-2020-3203?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2020-3203?

No fix has been published for CVE-2020-3203 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-2020-3203 being exploited?

There is no known exploitation of CVE-2020-3203 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-j6v9-29xf-j8q4.