MEDIUM 4.7 Microsoft

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.

Microsoft Security Update 2023-Jan: 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.

Affected Products

References

Published: 2023-01-10 · Source: Microsoft · Feed updated: 2026-08-04
This medium severity vulnerability with a CVSS score of 4.7 was published on 2023-01-10 via Microsoft. Affected: fluent-bit-2.0.9-1.cm2.x86_64.rpm on CBL Mariner 2.0 x64, fluent-bit-devel-2.0.9-1.cm2.x86_64.rpm on CBL Mariner 2.0 x64, fluent-bit-debuginfo-2.0.9-1.cm2.x86_64.rpm on CBL Mariner 2.0 x64 and 5 more.
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