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-2011-1829 high priority: Ubuntu including 1 source packages (apt), 5 status rows across 5 suites (hardy, lucid, maverick, natty, upstream): not-affected 3, needs-triage 1, released 1.
APT before 0.8.15.2 does not properly validate inline GPG signatures, which allows man-in-the-middle attackers to install modified packages via vectors involving lack of an initial clearsigned message.