Jami needs "Known Vulnerability"-Lable to warn the users about a very insecure and dangerous feature.
Vulnerability: If you share your account to another device via internet, it is encrypted with an very weak 8 chars long password and published on DHT so that a lot of random people can get the "encrypted" file. This bad password can be prevented but you need extra knowledge (that this depends on an extra passphrase for your account) to do so.
See here: