VDB
CVE-2021-36647
CVE-2021-36647
PUBLISHED
CVSS 4.699999809265137 MEDIUM
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.
EPSS 0.05% · 16.0th percentile
Risk Scores
CVSS v3.1
4.699999809265137
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS Score
0.05%
16.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
| arm | mbed_tls | 0, 2.17.0, 2.28.0 |
Timeline
- Jan 17, 2023 CVE Published
- Jan 18, 2023 EPSS Score
- Feb 28, 2023 EPSS Score
- Mar 7, 2023 EPSS Score
- Apr 9, 2023 EPSS Score
- May 20, 2023 EPSS Score
- Jun 29, 2023 EPSS Score
- Aug 9, 2023 EPSS Score
- Sep 18, 2023 EPSS Score
- Oct 29, 2023 EPSS Score
- Dec 8, 2023 EPSS Score
- Jan 18, 2024 EPSS Score
References
- https://kouzili.com/Load-Step.pdf url
- https://github.com/ARMmbed/mbedtls/releases/ url
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 url
- https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html url
- https://nvd.nist.gov/vuln/detail/CVE-2021-36647 advisory
- https://github.com/ARMmbed/mbedtls/releases url