OpenIPMI before 2.0.36 has an out-of-bounds array access (for authentication type) in the ipmi_sim simulator, resulting in denial of service or (with very low probability) authentication bypass or code execution.
Exploitability
AV:AAC:HPR:NUI:NScope
S:UImpact
C:LI:LA:L5/CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L