quagga (ospf6d) 0.99.21 has a DoS flaw in the way the ospf6d daemon performs routes removal
https://security-tracker.debian.org/tracker/CVE-2012-5521
https://exchange.xforce.ibmcloud.com/vulnerabilities/80096
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2012-5521
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-5521
https://access.redhat.com/security/cve/cve-2012-5521