Comment 4 for bug 1300785

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Salvatore Orlando (salvatore-orlando) wrote : Re: neutron allows security group rules with invalid cidrs, resulting in broken iptables rules (breaking iptables-restore)

The scope of the potential damage can vary as suggested by Cristoph.
It's not really a DoS, more an issue where security groups could be de-enforced without a user knowing it, since no information would be reflected in ports' statuses.

I agree about the security concern, but since the original bug is open, a security embargo is hardly enforceable now.