CVSS 3.1 Score 5.3 of 10 (medium)


Published Mar 13, 2024
CWE ID 476


CVE-2024-20266 is a vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software. It could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. The vulnerability occurs due to improper validation of certain DHCPv4 messages processed by an affected device. An attacker can exploit this by sending a malformed DHCPv4 message to the device, causing the dhcpd process to crash. During the approximately two-minute restart of the dhcpd process, DHCPv4 server services are unavailable, temporarily preventing network access for clients relying on the affected device's DHCPv4 server. Only the dhcpd process crashes and automatically restarts without router reload. The vulnerability has a base severity rating of MEDIUM and requires no privileges or user interaction for exploitation.

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