KDE kmail before 5.5.2 and messagelib before 5.5.2, as distributed in KDE Applications before 17.04.2, do not ensure that a plugin's sign/encrypt action occurs during use of the Send Later feature, which allows remote attackers to obtain sensitive information by sniffing the network.
Unspecified vulnerability in kdebase allows local users to cause a denial of service (KDM login inaccessible, or resource consumption) via unknown vectors.
KDE file manager (kfm) uses a TCP server for certain file operations, which allows remote attackers to modify arbitrary files by sending a copy command to the server.