VDB
CVE-2021-36647
CVE-2021-36647
PUBLISHED
CVSS 4.7 MEDIUM
Reported by mitre · Published January 17, 2023
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.
Risk scores
CVSS 3.1
4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
| n/a | n/a | * |
Timeline
- Jan 17, 2023 CVE Published
- Jan 18, 2023 EPSS Score (30 in total, the first dated here)
- Nov 3, 2025 CVE Updated
- Apr 3, 2026 Security Advisory
- Jul 27, 2026 Coalition ESS Score
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2021-36647
vulnetix vdb fixes CVE-2021-36647Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
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