This update rebases the nss, nss-util, and nss-softokn packages to nss-3.15.3 and nspr to nspr-4.10.2 in order to address security-relevant bugs have been resolved in NSS 3.15.3.
For further details please refer to the upstream release notes at
This update can be installed with the "yum" update program. Use su -c 'yum update nss-softokn' at the command line. For more information, refer to "Managing Software with yum", available at http://docs.fedoraproject.org/yum/.