CVE-2020-3120 Cisco FXOS, IOS XR, and NX-OS Software Cisco Discovery Protocol Denial of Service Vulnerability
An adjacent attacker can cause a device reload and denial of service by sending malicious Cisco Discovery Protocol packets to affected Cisco network operating systems.
- 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-2020-3120?
CVE-2020-3120 is a high-severity denial of service vulnerability in Cisco Firepower Extensible Operating System, published on 5 Feb 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the Cisco Discovery Protocol implementation for Cisco FXOS Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing check when the affected software processes Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to exhaust system memory, causing the device to reload. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
Weakness: CWE-190
Which versions are affected by CVE-2020-3120?
It affects 5 products.
Products include Cisco Firepower Extensible Operating System, Cisco Fxos, Cisco Ios Xr, Cisco Nx-Os, Cisco Ucs Manager.
How do I fix CVE-2020-3120?
No fix has been published for CVE-2020-3120 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-2020-3120 being exploited?
There is no known exploitation of CVE-2020-3120 in the wild and no public exploit code.
Other vulnerabilities in Cisco Firepower Extensible Operating System
- CVE-2018-0310 Information disclosure in Cisco FXOS and NX-OS unknown
- CVE-2015-6435 Command injection in n/a
- CVE-2021-1368 Memory corruption in Cisco NX-OS Software
- CVE-2020-3456 Cisco FXOS Software Firepower Chassis Manager Cross-Site Request Forgery Vulnerability
- CVE-2020-3172 Cisco FXOS and NX-OS Software Cisco Discovery Protocol Arbitrary Code Execution and Denial of Service Vulnerability
All Cisco Firepower Extensible Operating System vulnerabilities
Sources
Also known as GHSA-vw86-rxwf-9vhm.