The dissect_dcom_OBJREF function in epan/dissectors/packet-dcom.c in the DCOM dissector in Wireshark 1.12.x before 1.12.9 does not initialize a certain IPv4 data structure, which allows remote attackers to cause a denial of service (application crash) via a crafted packet.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.