Ventrilo is a Voice over IP group communication server.
Luigi Auriemma reported a NULL pointer dereference in Ventrilo when processing packets with an invalid version number followed by another packet.
A remote attacker could send specially crafted packets to the server, resulting in a crash.
There is no known workaround at this time.
All Ventrilo users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-sound/ventrilo-server-bin-3.0.3"