Todd Miller's sudo version 1.8.20 and earlier is vulnerable to an input validation (embedded spaces) in the get_process_ttyname() function resulting in information disclosure and command execution.
Exploitability
AV:LAC:HPR:HUI:NScope
S:UImpact
C:HI:HA:H6.4/CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H