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-2011-3374 critical priority: Ubuntu including 1 source packages (apt), 5 status rows across 5 suites (hardy, lucid, maverick, natty, upstream): released 4, not-affected 1.
It was found that apt-key in apt, all versions, do not correctly validate gpg keys with the master keyring, leading to a potential man-in-the-middle attack.