DHCPv6 is the IPv6 version of the Dynamic Host Configuration Protocol. It lets a network server provide clients with configuration such as IPv6 addresses, prefixes, DNS servers, and other options they need to communicate. The protocol typically uses UDP ports 546 and 547, and it is a core part of many IPv6 deployments.
In cyber security, DHCPv6 matters because it runs on trusted network infrastructure and processes unauthenticated packets from nearby devices. That makes its parsers and daemons attractive targets: a malformed request, reply, or option field can expose memory-safety bugs, enable denial of service, or in severe cases lead to code execution. Attackers may abuse rogue DHCPv6 servers to push bad configuration or target the service directly with crafted packets. Defenders reduce risk by patching network daemons, disabling DHCPv6 where it is not needed, and limiting exposure to trusted interfaces and segments.