The dtls1_listen function in d1_lib.c in OpenSSL 1.0.2 before 1.0.2a does not properly isolate the state information of independent data streams, which allows remote attackers to cause a denial of service (application crash) via crafted DTLS traffic, as demonstrated by DTLS 1.0 traffic to a DTLS 1.2 server.
https://security.gentoo.org/glsa/201503-11
https://kc.mcafee.com/corporate/index?page=content&id=SB10110
https://bugzilla.redhat.com/show_bug.cgi?id=1202351
https://bto.bluecoat.com/security-advisory/sa92
http://www.securitytracker.com/id/1031929
http://www.securityfocus.com/bid/73229
http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://marc.info/?l=bugtraq&m=144050297101809&w=2