CVE-2018-0189

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of service disruption.

Exploit odds

1.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2018-03-28 22:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:30 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.0% in the next 30 days (EPSS).
• Severity: 5.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2018-03-28 22:29 UTC

Last modified

2026-06-17 01:30 UTC

Exploit probability

1.0% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Cisco iOS Xe < 15.5\(3\)s5
• Cisco iOS Xe < 15.5\(3\)m5
• Cisco iOS Xe < 15.4\(3\)s7
• Cisco iOS Xe < 15.4\(2\)s1
• Cisco iOS Xe < 15.4\(1\)s1
• Cisco iOS Xe < 15.4\(1\)s0a
• Cisco iOS Xe < 15.2\(5\)e1
• Cisco iOS Xe < 15.2\(4\)e5

Attack profile CVSS 3.0 · 5.3

Attack vector

Network

Complexity

High

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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