CVE-2021-36647
Severity Score
4.7
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track
*SSVC
Descriptions
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.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-07-12 CVE Reserved
- 2023-01-17 CVE Published
- 2025-03-30 EPSS Updated
- 2025-04-08 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-327: Use of a Broken or Risky Cryptographic Algorithm
CAPEC
References (3)
| URL | Tag | Source |
|---|---|---|
| https://github.com/ARMmbed/mbedtls/releases | Third Party Advisory | |
| https://kouzili.com/Load-Step.pdf | Third Party Advisory |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 | 2023-01-27 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Arm Search vendor "Arm" | Mbed Tls Search vendor "Arm" for product "Mbed Tls" | < 2.16.11 Search vendor "Arm" for product "Mbed Tls" and version " < 2.16.11" | - |
Affected
| ||||||
| Arm Search vendor "Arm" | Mbed Tls Search vendor "Arm" for product "Mbed Tls" | >= 2.17.0 < 2.27.0 Search vendor "Arm" for product "Mbed Tls" and version " >= 2.17.0 < 2.27.0" | - |
Affected
| ||||||
| Arm Search vendor "Arm" | Mbed Tls Search vendor "Arm" for product "Mbed Tls" | >= 2.28.0 < 3.0.0 Search vendor "Arm" for product "Mbed Tls" and version " >= 2.28.0 < 3.0.0" | - |
Affected
| ||||||