CVE-2018-0257: Cisco IOS XE

Medium severity, CVSS 4.3. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco IOS XE: from 3.18, up to and including 3.18.4; from 16.6, up to and including 16.6.3; after 16.7, up to and including 16.7.2; version 15.6(2)sp only; version 16.4 only; version 16.5 only

Published 2018-04-19. Last modified 2026-06-17.