Answer:
While transiting from IPv4 to IPv6, many offices and companies use both the protocols (Ipv4 and IPv6) at the same time. This scenario can increase the risk rate of attack twice. All the flaws and vulnerabilities could be overlooked easily when transition is done.
On the other hand, while transiting Ipv6 to IPv4, the router does not tells or depicts that the communication is appropriate or if it could be used as a part of DoS attack that make it so much harder to trace the origin back.
The reason for the vulnerability of Transport Relay Translators (TRT) is that they do not apply Internet Protocol Security (IPSec) and thats why they are not secure.
i hope it will help you!
