Tails before 1.7 includes the wget program but does not prevent automatic fallback from passive FTP to active FTP, which allows remote FTP servers to discover the Tor client IP address by reading a (1) PORT or (2) EPRT command. NOTE: within wget itself, the automatic fallback is not considered a vulnerability by CVE.
https://tails.boum.org/news/version_1.7/index.en.html
https://mailman.boum.org/pipermail/tails-dev/2015-October/009591.html
https://mailman.boum.org/pipermail/tails-dev/2015-August/009370.html
https://lists.gnu.org/archive/html/bug-wget/2015-08/msg00020.html
https://labs.riseup.net/code/issues/10364
http://www.securityfocus.com/bid/76678
http://www.openwall.com/lists/oss-security/2015/10/01/10
http://git.savannah.gnu.org/cgit/wget.git/commit/?id=075d7556964f5a871a73c22ac4b69f5361295099