You should 'yum update' as soon as possible to resolve this issue. Here's why you should care: https://securityblog.redhat.com/2014/09/24/bash-specially-crafted-environment-variables-code-injection-attack/ Links to the centos updates: CentOS-5: http://lists.centos.org/pipermail/centos-announce/2014-September/020582.html CentOS-6: http://lists.centos.org/pipermail/centos-announce/2014-September/020585.html CentOS-7: http://lists.centos.org/pipermail/centos-announce/2014-September/020583.html -- Jim Perrin The CentOS Project | http://www.centos.org twitter: @BitIntegrity | GPG Key: FA09AD77