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.
Published: 2023-01-17
Score: 4.7 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4236-1 mbedtls security update
EUVD EUVD EUVD-2021-23243 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.
History

Mon, 03 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
References

Tue, 08 Apr 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Subscriptions

Arm Mbed Tls
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-11-03T19:26:11.739Z

Reserved: 2021-07-12T00:00:00.000Z

Link: CVE-2021-36647

cve-icon Vulnrichment

Updated: 2024-08-04T01:01:58.158Z

cve-icon NVD

Status : Modified

Published: 2023-01-17T21:15:10.880

Modified: 2025-11-03T20:15:49.343

Link: CVE-2021-36647

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses