An issue was discovered in Arm Mbed TLS before 2.23.0. Because of a side channel in modular exponentiation, an RSA private key used in a secure enclave could be disclosed.
{
"sources": [
{
"imported": "2026-07-17T20:44:40.315Z",
"published": "2021-07-19T17:15:11.133Z",
"database_specific": {
"status": "Modified"
},
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2020-36421",
"id": "CVE-2020-36421",
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2020-36421",
"modified": "2026-06-17T03:15:27.207Z"
}
],
"license": "CC-BY-4.0"
}