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NVD Vulnerability Details :
CVE-2021-36647
Modified
More InfoOfficial Page
Source-cve@mitre.org
View Known Exploited Vulnerability (KEV) details
Published At-17 Jan, 2023 | 21:15
Updated At-03 Nov, 2025 | 20:15

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.14.7MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Secondary3.14.7MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Type: Primary
Version: 3.1
Base score: 4.7
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 4.7
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CPE Matches
Arm Limited
arm
>>mbed_tls>>Versions before 2.16.11(exclusive)
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Arm Limited
arm
>>mbed_tls>>Versions from 2.17.0(inclusive) to 2.27.0(exclusive)
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Arm Limited
arm
>>mbed_tls>>Versions from 2.28.0(inclusive) to 3.0.0(exclusive)
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-327Primarynvd@nist.gov
CWE-327Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-327
Type: Primary
Source: nvd@nist.gov
CWE ID: CWE-327
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/ARMmbed/mbedtls/releases/cve@mitre.org
Third Party Advisory
https://kouzili.com/Load-Step.pdfcve@mitre.org
Third Party Advisory
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1cve@mitre.org
Vendor Advisory
https://github.com/ARMmbed/mbedtls/releases/af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://kouzili.com/Load-Step.pdfaf854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/06/msg00034.htmlaf854a3a-2127-422b-91ae-364da2661108
N/A
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
Hyperlink: https://github.com/ARMmbed/mbedtls/releases/
Source: cve@mitre.org
Resource:
Third Party Advisory
Hyperlink: https://kouzili.com/Load-Step.pdf
Source: cve@mitre.org
Resource:
Third Party Advisory
Hyperlink: https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1
Source: cve@mitre.org
Resource:
Vendor Advisory
Hyperlink: https://github.com/ARMmbed/mbedtls/releases/
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Hyperlink: https://kouzili.com/Load-Step.pdf
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Hyperlink: https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html
Source: af854a3a-2127-422b-91ae-364da2661108
Resource: N/A
Hyperlink: https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Vendor Advisory
Change History
0Changes found
Details not found