Race condition in wget 1.17 and earlier, when used in recursive or mirroring mode to download a single file, might allow remote servers to bypass intended access list restrictions by keeping an HTTP connection open.
https://www.exploit-db.com/exploits/40824/
https://lists.debian.org/debian-lts-announce/2020/01/msg00031.html
http://www.securityfocus.com/bid/93157
http://www.openwall.com/lists/oss-security/2016/08/27/2
http://lists.opensuse.org/opensuse-updates/2017-01/msg00007.html
http://lists.opensuse.org/opensuse-updates/2016-09/msg00044.html
http://lists.gnu.org/archive/html/bug-wget/2016-08/msg00134.html