epan/dissectors/packet-gtpv2.c in the GTPv2 dissector in Wireshark 1.8.x before 1.8.7 calls incorrect functions in certain contexts related to ciphers, which allows remote attackers to cause a denial of service (application crash) 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.