ZNC is an advanced IRC bouncer.
Multiple NULL pointer dereferences have been found in ZNC.
A remote attacker could send a specially crafted request, possibly resulting in a Denial of Service condition.
There is no known workaround at this time.
All ZNC users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-irc/znc-1.2-r1"