XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in update_screen_layout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.
Exploitability
AV:PAC:LPR:NUI:NScope
S:UImpact
C:NI:NA:H4.6/CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H