CVE-2018-0395 Cisco FXOS and NX-OS Software Link Layer Discovery Protocol Denial of Service Vulnerability

High 8.8 Published 17 Oct 2018 Updated 26 Nov 2024

An unauthenticated adjacent attacker can cause a denial of service by sending a crafted LLDP packet to Cisco network devices, triggering an unexpected reload.

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-2018-0395?

CVE-2018-0395 is a high-severity denial of service vulnerability in Cisco Firepower Extensible Operating System, published on 17 Oct 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the Link Layer Discovery Protocol (LLDP) implementation for Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition when the device unexpectedly reloads. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface on the targeted device. A successful exploit could allow the attacker to cause the switch to reload unexpectedly.

Weakness: CWE-20

Which versions are affected by CVE-2018-0395?

It affects 2 products.

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

How do I fix CVE-2018-0395?

No fix has been published for CVE-2018-0395 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-2018-0395 being exploited?

There is no known exploitation of CVE-2018-0395 in the wild and no public exploit code.

All Cisco Firepower Extensible Operating System vulnerabilities

Sources

Also known as GHSA-3wmx-fc2q-p8g5.