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-2016-7153 low priority: Ubuntu including 4 source packages (chromium-browser, firefox, oxide-qt, thunderbird), 24 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): ignored 15, DNE 5, needed 2, needs-triage 2.
The HTTP/2 protocol does not consider the role of the TCP congestion window in providing information about content length, which makes it easier for remote attackers to obtain cleartext data by leveraging a web-browser configuration in which third-party cookies are sent, aka a "HEIST" attack.