rrdtool is vulnerable to denial of service. The vulnerability exists due to a format string vulnerability in the rrdtool module allowing an attacker to crash the system.
git://git.launchpad.net/ubuntu-cve-tracker/tree/active/CVE-2013-2131
www.openwall.com/lists/oss-security/2013/04/18/5
www.openwall.com/lists/oss-security/2013/05/19/5
www.openwall.com/lists/oss-security/2013/05/31/2
bugzilla.redhat.com/show_bug.cgi?id=969296
github.com/oetiker/rrdtool-1.x/issues/396
github.com/oetiker/rrdtool-1.x/pull/397