It was found that ejabberd does not enforce the starttls_required setting when compression is used, which causes clients to establish connections without encryption.
For Debian 7 Wheezy, this problem has been fixed in version 2.1.10-4+deb7u2.
This update also disables the insecure SSLv3.
We recommend that you upgrade your ejabberd packages.
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS