CVE-2021-36647

Use of a Broken or Risky Cryptographic Algorithm in the function
mbedtls_mpi_exp_mod() in lignum.c in Mbed TLS Mbed TLS all versions before
3.0.0, 2.27.0 or 2.16.11 allows attackers with access to precise enough
timing and memory access information (typically an untrusted operating
system attacking a secure enclave such as SGX or the TrustZone secure
world) to recover the private keys used in RSA.