CVE-2021-36647

MediumCVSS 4.7/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 4.7/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-327

Affected software

No affected versions have been published.

Timeline

Published
Jan 17, 2023
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-36647: Medium severity, CVSS 4.7 | Vulnix