It's been found that multiple functions in ipmitool before 1.8.19 neglect proper checking of the data received from a remote LAN party, which may lead to buffer overflows and potentially to remote code execution on the ipmitool side. This is especially dangerous if ipmitool is run as a privileged user. This problem is fixed in version 1.8.19.
https://security.gentoo.org/glsa/202101-03
https://lists.debian.org/debian-lts-announce/2021/06/msg00029.html
https://lists.debian.org/debian-lts-announce/2020/02/msg00006.html
https://github.com/ipmitool/ipmitool/security/advisories/GHSA-g659-9qxw-p7cp
https://github.com/ipmitool/ipmitool/commit/e824c23316ae50beb7f7488f2055ac65e8b341f2
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00031.html