Cscope is a developer's tool for browsing source code.
Unchecked use of strcpy() and *scanf() leads to several buffer overflows.
A user could be enticed to open a carefully crafted file which would allow the attacker to execute arbitrary code with the permissions of the user running Cscope.
There is no known workaround at this time.
All Cscope users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-util/cscope-15.5.20060927"