The Fedora Secure Boot CA certificate shipped with shim in Fedora was expired which could lead to old or invalid signed boot components being loaded.
Exploitability
AV:LAC:HPR:HUI:NScope
S:UImpact
C:NI:HA:N4.1/CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:NOther