An ipmitool security update has been released for CentOS 6.

CentOS-announce: CESA-2020:1331 Important CentOS 6 ipmitool Security Update

CentOS Errata and Security Advisory 2020:1331 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:1331

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
fe098e08061bc5f26a3ccf7cf13727bcb81372ed1b075f8f6bb72760b554a839 ipmitool-1.8.15-3.el6_10.i686.rpm

x86_64:
07ff5fac0cc78ed7bc23e72e668073b9ed878ecc9255021783e22d1f4fe3fcbb ipmitool-1.8.15-3.el6_10.x86_64.rpm

Source:
00383fb3bf567a510f400d60bf8e8626bc350a00fbaeac9280db242b7f770bcb ipmitool-1.8.15-3.el6_10.src.rpm