When eperl is installed setuid root, it can switch to the UID/GID of the scripts owner. Although Debian doesn't ship the program setuid root, this is a useful feature which people may have activated locally. When the program is used as /usr/lib/cgi-bin/nph-eperl the bugs could lead into a remote vulnerability as well.
Version 2.2.14-0.7potato2 fixes this; we recommend you upgrade your eperl package immediately.