Ver.3使ってるやつは今すぐ最新版にアップデートしろ
2使ってるやつも設定見直せ

A very serious security vulnerability has been found in uTorrent.
All users who use this client are strongly advised to take measures.

If you have WebUI enabled, attackers can gain acces to pretty much any location within your computer,
download or upload files and execute them.
Apart from that, attackers can exploit uTorrent's RPC feature,
which is enabled by default, to access your uTorrent data, including your torrent files and passkeys.

The detailed description of this bug can be found here.
https://bugs.chromium.org/p/project-zero/issues/detail?id=1524

For versions 3.x of uTorrent a patch has been introduced in version 3.5.3,
but reportedly it does not completely solve the issue.
Even so, upgrade to the latest version immediately. And make sure you switch Web UI off in the settings.

While uTorrent 2.x is not effected by this issue to a critical extent,
you are advised to disable both WebUI and advanced setting "net.discoverable".