Use of a Broken or Risky Cryptographic Algorithm in the function mbedtlsmpiexp_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.
{
"sources": [
{
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-36647",
"published": "2023-01-17T21:15:10.880Z",
"id": "CVE-2021-36647",
"imported": "2025-11-20T23:04:02.205Z",
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-36647",
"modified": "2025-11-03T20:15:49.343Z"
}
],
"license": "CC-BY-4.0"
}