CVE-2018-0257 Denial of service in Cisco cBR Series Converged Broadband Routers

Medium 4.3 Published 19 Apr 2018 Updated 29 Nov 2024

Unauthenticated adjacent attackers can cause denial of service on Cisco cBR routers by sending malicious DHCP packets that trigger high CPU usage.

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-2018-0257?

CVE-2018-0257 is a medium-severity denial of service vulnerability in Cisco Ios Xe, published on 19 Apr 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in Cisco IOS XE Software running on Cisco cBR Series Converged Broadband Routers could allow an unauthenticated, adjacent attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to the incorrect handling of certain DHCP packets. An attacker could exploit this vulnerability by sending certain DHCP packets to a specific segment of an affected device. A successful exploit could allow the attacker to increase CPU usage on the affected device and cause a DoS condition. Cisco Bug IDs: CSCvg73687.

Weakness: CWE-399

Which versions are affected by CVE-2018-0257?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2018-0257?

No fix has been published for CVE-2018-0257 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-2018-0257 being exploited?

There is no known exploitation of CVE-2018-0257 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-pgx5-6r92-gp92.