CVE-2024-20266

Summary

CVE-2024-20266 is a vulnerability affecting the DHCPv4 server feature in Cisco IOS XR Software. An unauthenticated, remote attacker can exploit this issue by sending a malformed DHCPv4 message, causing the dhcpd process to crash, leading to a denial of service (DoS) condition. The process restarts automatically, but DHCPv4 services are unavailable for approximately two minutes, potentially preventing network access to newly joining clients. Only the dhcpd process is affected, with the router itself not reloading. This vulnerability is specific to DHCPv4 and does not impact DHCPv6.

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