Use of a Broken or Risky Cryptographic Algorithm Affecting mbedtls package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.16% (7th percentile)

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  • Snyk IDSNYK-UBUNTU1804-MBEDTLS-3235650
  • published21 Mar 2026
  • disclosed17 Jan 2023

Introduced: 17 Jan 2023

CVE-2021-36647  (opens in a new tab)
CWE-327  (opens in a new tab)

How to fix?

There is no fixed version for Ubuntu:18.04 mbedtls.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mbedtls package and not the mbedtls package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1