View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2012-2101 medium priority: Ubuntu including 1 source packages (nova), 7 status rows across 7 suites (hardy, lucid, natty, oneiric, precise, quantal, upstream): released 3, DNE 2, ignored 1, needs-triage 1.
Openstack Compute (Nova) Folsom, 2012.1, and 2011.3 does not limit the number of security group rules, which allows remote authenticated users with certain permissions to cause a denial of service (CPU and hard drive consumption) via a network request that triggers a large number of iptables rules.