It was found that apt-key in apt, all versions, do not correctly validate gpg keys with the master keyring, leading to a potential man-in-the-middle attack.
Exploitability
AV:NAC:HPR:NUI:NScope
S:UImpact
C:NI:LA:N3.7/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N