In kdeconnect-kde (aka KDE Connect) before 20.08.2, an attacker on the local network could send crafted packets that trigger use of large amounts of CPU, memory, or network connection slots, aka a Denial of Service attack.
Gentoo Linux Security Advisory 202101-16 - A vulnerability in KDE Connect could lead to a Denial of Service condition. Versions less than 20.04.3-r1 are affected.