The IPMI 2.0 specification supports RMCP+ Authenticated Key-Exchange Protocol (RAKP) authentication, which allows remote attackers to obtain password hashes and conduct offline password guessing attacks by obtaining the HMAC from a RAKP message 2 response from a BMC.
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-c04197764
https://security.netapp.com/advisory/ntap-20190919-0005/
https://nvidia.custhelp.com/app/answers/detail/a_id/5010
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html