Tornado before 3.2.2 sends arbitrary responses that contain a fixed CSRF token and may be sent with HTTP compression, which makes it easier for remote attackers to conduct a BREACH attack and determine this token via a series of crafted requests.
openwall.com/lists/oss-security/2015/05/19/4
www.tornadoweb.org/en/stable/releases/v3.2.2.html
bugzilla.novell.com/show_bug.cgi?id=930362
bugzilla.redhat.com/show_bug.cgi?id=1222816
github.com/tornadoweb/tornado
github.com/tornadoweb/tornado/commit/1c36307463b1e8affae100bf9386948e6c1b2308
nvd.nist.gov/vuln/detail/CVE-2014-9720