What’s Vulnerable › Vulnerabilities
CVE-2024-20446: Cisco NX-OS Software DHCPv6 Relay Agent Denial of Service Vulnerability
- Severity: high (CVSS 8.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-08-28 · updated 2026-06-17
- Weakness: CWE-476
Description
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 NX-OS: 10.2\(1\), 10.2\(1q\), 9.3\(9\), 8.2\(11\)
References
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