A Null pointer dereference vulnerability exists in Mozilla Network Security Services due to a missing NULL check in PK11_SignWithSymKey / ssl3_ComputeRecordMACConstantTime, which could let a remote malicious user cause a Denial of Service.
https://security.gentoo.org/glsa/201701-46
https://bugzilla.mozilla.org/show_bug.cgi?id=1306103
https://bto.bluecoat.com/security-advisory/sa137
http://www.ubuntu.com/usn/USN-3163-1
http://www.securityfocus.com/bid/94349
http://rhn.redhat.com/errata/RHSA-2016-2779.html
http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00049.html
http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00037.html
http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00011.html