Mozilla’s Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications. Mozilla Network Security Services (NSS) 3.14 before 3.14.5 and 3.15 before 3.15.3 allows remote attackers to cause a denial of service or possibly have unspecified other impact via invalid handshake packets. It is recommended to upgrade your nss packages as indicated below.
Read more here – http://www.cvedetails.com/cve/CVE-2013-5605/