Incorrect check in Intel processors from 6th and 7th Generation Intel Core Processor Families, Intel Xeon E3-1500M v5 and v6 Product Families, and Intel Xeon E3-1200 v5 and v6 Product Families allows compromised system firmware to impact SGX security via incorrect early system state.
Intel Processor
Exploit
CVE-2017-5691
NVD
Refer to CVE-2017-5691 NVD advisory