The TLS protocol 1.2 and earlier, as used in Mozilla Firefox, Google Chrome, Qt, and other products, can encrypt compressed data without properly obfuscating the length of the unencrypted data, which allows man-in-the-middle attackers to obtain plaintext HTTP headers by observing length differences during a series of guesses in which a string in an HTTP request potentially matches an unknown string in an HTTP header, aka a "CRIME" attack.
http://code.google.com/p/chromium/issues/detail?id=139744
http://jvndb.jvn.jp/en/contents/2016/JVNDB-2016-000129.html
http://jvn.jp/en/jp/JVN65273415/index.html
http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101366.html
http://lists.opensuse.org/opensuse-updates/2012-10/msg00096.html
http://lists.opensuse.org/opensuse-updates/2013-01/msg00034.html
http://lists.opensuse.org/opensuse-updates/2013-01/msg00048.html
http://marc.info/?l=bugtraq&m=136612293908376&w=2
http://rhn.redhat.com/errata/RHSA-2013-0587.html
https://bugzilla.redhat.com/show_bug.cgi?id=857051
https://gist.github.com/3696912
https://github.com/mpgn/CRIME-poc
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18920
http://support.apple.com/kb/HT5784
http://www.debian.org/security/2012/dsa-2579
http://www.debian.org/security/2013/dsa-2627
http://www.debian.org/security/2015/dsa-3253
http://www.ubuntu.com/usn/USN-1627-1