Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

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.

Published

2023-01-17T21:15:10.880

Last Modified

2025-04-08T21:15:44.210

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.7 (MEDIUM)

Weaknesses

Type: Primary
CWE-327
Type: Secondary
CWE-327

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	arm	mbed_tls	< 2.16.11	Yes
Application	arm	mbed_tls	< 2.27.0	Yes
Application	arm	mbed_tls	< 3.0.0	Yes

References

https://github.com/ARMmbed/mbedtls/releases/ Third Party Advisory ([email protected])
https://kouzili.com/Load-Step.pdf Third Party Advisory ([email protected])
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 Vendor Advisory ([email protected])
https://github.com/ARMmbed/mbedtls/releases/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://kouzili.com/Load-Step.pdf Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)