The dissect_oampdu_event_notification function in epan/dissectors/packet-slowprotocols.c in the IEEE 802.3 Slow Protocols dissector in Wireshark 1.6.x before 1.6.13 and 1.8.x before 1.8.5 does not properly handle certain short lengths, which allows remote attackers to cause a denial of service (infinite loop) via a malformed 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.