CVEvulnerability
CVE-2021-36647
4.7 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2023-01-17
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 4.7 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 4.7 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-327
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.
Affected configurations
• arm mbed tls (< 2.16.11)
• arm mbed tls (>= 2.17.0 < 2.27.0)
• trustedfirmware mbed tls (>= 2.28.0 < 3.0.0)
Related
Weakness · CWE (1)
- CWE-327 Use of a Broken or Risky Cryptographic Algorithm weakness
References
- https://github.com/ARMmbed/mbedtls/releases/ Third Party Advisory
- https://kouzili.com/Load-Step.pdf Third Party Advisory
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 Vendor Advisory
- https://github.com/ARMmbed/mbedtls/releases/ Third Party Advisory
- https://kouzili.com/Load-Step.pdf Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html lists.debian.org
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 Vendor Advisory