RealPlayer is a multimedia player capable of handling multiple multimedia file formats.
RealPlayer is vulnerable to a heap overflow when opening RealMedia files which make use of RealText.
By enticing a user to play a specially crafted RealMedia file an attacker could execute arbitrary code with the permissions of the user running the application.
There is no known workaround at this time.
All RealPlayer users should upgrade to the latest available version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-video/realplayer-10.0.5"