CVE-2024-20446: Cisco NX-OS Software

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

A vulnerability in the DHCPv6 relay agent of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of specific fields in a DHCPv6 RELAY-REPLY message. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to any IPv6 address that is configured on an affected device. A successful exploit could allow the attacker to cause the dhcp_snoop process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition.

Affected products

• Cisco Cisco NX-OS Software: version 10.2(1) only; version 10.2(1q) only; version 9.3(9) only; version 8.2(11) only
• Cisco NX-OS

Published 2024-08-28. Last modified 2026-06-17.