CVE-2018-0189 Denial of service in Cisco IOS and IOS XE

Medium 5.3 Published 28 Mar 2018 Updated 2 Dec 2024

An unauthenticated network attacker can cause a denial of service by injecting specific recursive routes into Cisco IOS devices, forcing a reload.

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-2018-0189?

CVE-2018-0189 is a medium-severity denial of service vulnerability in Cisco Ios Xe, published on 28 Mar 2018. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability in the Forwarding Information Base (FIB) code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, network attacker to cause a denial of service (DoS) condition. The vulnerability is due to a limitation in the way the FIB is internally representing recursive routes. An attacker could exploit this vulnerability by injecting routes into the routing protocol that have a specific recursive pattern. The attacker must be in a position on the network that provides the ability to inject a number of recursive routes with a specific pattern. An exploit could allow the attacker to cause an affected device to reload, creating a DoS condition. Cisco Bug IDs: CSCva91655.

Weakness: CWE-399

Which versions are affected by CVE-2018-0189?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2018-0189?

No fix has been published for CVE-2018-0189 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-2018-0189 being exploited?

There is no known exploitation of CVE-2018-0189 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-xhgx-g6j2-m588.