The ptvcursor_add function in the ptvcursor implementation in epan/proto.c in Wireshark 1.12.x before 1.12.7 does not check whether the expected amount of data is available, which allows remote attackers to cause a denial of service (application crash) via a crafted packet. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6248
