Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-20B92374-D62A-11E9-AF73-001B217E4EE5:
Internet Systems Consortium, Inc. reports:
A packet containing a malformed DUID can cause the kea-dhcp6 server to terminate (CVE-2019-6472) [Medium]
An invalid hostname option can cause the kea-dhcp4 server to terminate (CVE-2019-6473) [Medium]
An oversight when validating incoming client requests can lead to a situation where the Kea server
will exit when trying to restart (CVE-2019-6474) [Medium]
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