Portable UPnP SDK (aka libupnp) before 1.6.21 allows remote attackers to write to arbitrary files in the webroot via a POST request without a registered handler.
https://www.tenable.com/security/research/tra-2017-10
https://www.exploit-db.com/exploits/40589/
https://twitter.com/mjg59/status/755062278513319936
https://sourceforge.net/p/pupnp/code/ci/master/tree/ChangeLog
https://security.gentoo.org/glsa/201701-52
https://github.com/mjg59/pupnp-code/commit/be0a01bdb83395d9f3a5ea09c1308a4f1a972cbd
http://www.securityfocus.com/bid/92050
http://www.openwall.com/lists/oss-security/2016/07/20/5