CVE-2024-20259: Cisco IOS XE

High severity, CVSS 8.6. EPSS: 0.8% chance of exploitation in the next 30 days.

A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to a crafted IPv4 DHCP request packet being mishandled when endpoint analytics are enabled. An attacker could exploit this vulnerability by sending a crafted DHCP request through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: The attack vector is listed as network because a DHCP relay anywhere on the network could allow exploits from networks other than the adjacent one.

Affected products

• Cisco IOS XE: version 17.1.1 only; version 17.1.1a only; version 17.1.1s only; version 17.1.1t only; version 17.1.3 only; version 17.2.1 only; …

Published 2024-03-27. Last modified 2026-06-17.