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-2012-6639 low priority: Ubuntu including 1 source packages (cloud-init), 12 status rows across 12 suites (lucid, precise, quantal, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): not-affected 8, ignored 2, DNE 1, needs-triage 1.
An privilege elevation vulnerability exists in Cloud-init before 0.7.0 when requests to an untrusted system are submitted for EC2 instance data.