In systemd 259, systemd-journald can send ANSI escape sequences to the terminals of arbitrary users when a "logger -p emerg" command is executed, if ForwardToWall=yes is set.
Exploitability
AV:LAC:HPR:NUI:NScope
S:UImpact
C:NI:LA:N2.9/CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:NOther