The DTLS implementation in OpenSSL before 1.1.0 does not properly restrict the lifetime of queue entries associated with unused out-of-order messages, which allows remote attackers to cause a denial of service (memory consumption) by maintaining many crafted DTLS sessions simultaneously, related to d1_lib.c, statem_dtls.c, statem_lib.c, and statem_srvr.c.
https://www.tenable.com/security/tns-2016-21
https://www.tenable.com/security/tns-2016-20
https://www.tenable.com/security/tns-2016-16
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03856en_us
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=f5c7f5dfbaf0d2f7d946d0fe86f08e6bcb36ed0d
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://bto.bluecoat.com/security-advisory/sa132
http://www.splunk.com/view/SP-CAAAPUE
http://www.splunk.com/view/SP-CAAAPSV
http://www.securitytracker.com/id/1036689
http://www.securityfocus.com/bid/92987
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
http://www-01.ibm.com/support/docview.wss?uid=swg21995039
http://rhn.redhat.com/errata/RHSA-2016-1940.html
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759