CVE-2020-3517 Cisco FXOS and NX-OS Software Cisco Fabric Services Denial of Service Vulnerability

High 8.6 Published 27 Aug 2020 Updated 13 Nov 2024

Unauthenticated attackers can cause device reloads and denial of service by sending malicious Cisco Fabric Services messages to affected Cisco NX-OS devices.

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-2020-3517?

CVE-2020-3517 is a high-severity vulnerability in Cisco Firepower Extensible Operating System, published on 27 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Cisco Fabric Services component of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated attacker to cause process crashes, which could result in a denial of service (DoS) condition on an affected device. The attack vector is configuration dependent and could be remote or adjacent. For more information about the attack vector, see the Details section of this advisory. The vulnerability is due to insufficient error handling when the affected software parses Cisco Fabric Services messages. An attacker could exploit this vulnerability by sending malicious Cisco Fabric Services messages to an affected device. A successful exploit could allow the attacker to cause a reload of an affected device, which could result in a DoS condition.

Weakness: CWE-476

Which versions are affected by CVE-2020-3517?

It affects 2 products.

Products include Cisco Firepower Extensible Operating System, Cisco Nx-Os.

How do I fix CVE-2020-3517?

No fix has been published for CVE-2020-3517 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-3517 being exploited?

There is no known exploitation of CVE-2020-3517 in the wild and no public exploit code.

All Cisco Firepower Extensible Operating System vulnerabilities

Sources

Also known as GHSA-8cw5-4pj3-6hp9.