Zebedee is an application that establishes an encrypted, compressed tunnel for TCP/IP or UDP data transfer between two systems.
"Shiraishi.M" reported that Zebedee crashes when "0" is received as the port number in the protocol option header.
By performing malformed requests a remote attacker could cause Zebedee to crash.
There is no known workaround at this time.
All Zebedee users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose net-misc/zebedee