A new feature to prevent Firmware downgrades was recently added to some Lexmark products. A method to override this downgrade protection has been identified.
Exploitability
AV:AAC:LPR:HUI:NScope
S:UImpact
C:LI:LA:L4.3/CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L