strongSwan is an IPSec implementation for Linux.
A NULL pointer dereference and an error in the IKEv2 implementation have been found in strongSwan.
A remote attacker could create a Denial of Service condition or bypass security restrictions.
There is no known workaround at this time.
All strongSwan users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/strongswan-5.1.3"