Provide references for CVE-2017-6921.
Where can I find more information about CVE-2017-6921?
References are available at: http://www.securityfocus.com/bid/99222, https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple, http://www.securitytracker.com/id/1038781.