Security advisory
An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before 2.7.15. An attacker that can get precise enough side-channel measurements can recover the long-term ECDSA private key by (1) reconstructing the projective coordinate of the result of scalar multiplication by exploiting side channels in the conversion to affine coordinates; (2) using an attack described by Naccache, Smart, and Stern in 2003 to recover a few bits of the ephemeral scalar from those projective coordinates via several measurements; and (3) using a lattice attack to get from there to the long-term ECDSA private key used for the signatures. Typically an attacker would have sufficient access when attacking an SGX enclave and controlling the untrusted OS.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-10932
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:19 UTC · Revision 1
Source evidence
An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before 2.7.15. An attacker that can get precise enough side-channel measurements can recover the long-term ECDSA private key by (1) reconstructing the projective coordinate of the result of scalar multiplication by exploiting side channels in the conversion to affine coordinates; (2) using an attack described by Naccache, Smart, and Stern in 2003 to recover a few bits of the ephemeral scalar from those projective coordinates via several measurements; and (3) using a lattice attack to get from there to the long-term ECDSA private key used for the signatures. Typically an attacker would have sufficient access when attacking an SGX enclave and controlling the untrusted OS.
osv:CVE-2020-10932
Complete source record
{
"id": "d0c0c93ec95aacbc204ddbeaa1ef79b61c498839b3d8a176df69834e43bd7616",
"url": "https://osv.dev/vulnerability/CVE-2020-10932",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-10932",
"summary": "An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before 2.7.15. An attacker that can get precise enough side-channel measurements can recover the long-term ECDSA private key by (1) reconstructing the projective coordinate of the result of scalar multiplication by exploiting side channels in the conversion to affine coordinates; (2) using an attack described by Naccache, Smart, and Stern in 2003 to recover a few bits of the ephemeral scalar from those projective coordinates via several measurements; and (3) using a lattice attack to get from there to the long-term ECDSA private key used for the signatures. Typically an attacker would have sufficient access when attacking an SGX enclave and controlling the untrusted OS.",
"evidence": "osv:CVE-2020-10932",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-10932",
"aliases": [
"CVE-2020-10932"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/Mbed-TLS/mbedtls",
"type": "GIT",
"events": [
{
"introduced": "32605dc83042d737e715a685e53176388d73540e"
},
{
"fixed": "21522a49aa0d1e8b76e9b4d5d289f95cd85f2782"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.7.0"
},
{
"fixed": "2.7.15"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"mbedtls-2.7.14",
"mbedtls-2.7.13",
"mbedtls-2.7.12",
"mbedtls-2.7.11",
"mbedtls-2.7.9",
"mbedtls-2.7.8",
"mbedtls-2.7.7",
"mbedtls-2.7.6",
"mbedtls-2.7.5",
"mbedtls-2.7.4",
"mbedtls-2.7.0",
"mbedtls-2.7.3",
"mbedtls-2.7.2",
"mbedtls-2.7.2-rc1",
"mbedtls-2.7.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-10932.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/mbed-tls/mbedtls",
"type": "GIT",
"events": [
{
"introduced": "fb1972db23da39bd11d4f9c9ea6266eee665605b"
},
{
"fixed": "2a1d9332d55d1270084232e42df08fdb08129f1b"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.16.0"
},
{
"fixed": "2.16.6"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"mbedtls-2.16.5",
"mbedtls-2.16.4",
"mbedtls-2.16.3",
"mbedtls-2.16.2",
"mbedtls-2.16.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-10932.json"
}
}
],
"modified": "2026-10-24T10:30:17.280894983Z",
"provider": "osv",
"references": [
"https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/",
"https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-released",
"https://tls.mbed.org/tech-updates/security-advisories",
"https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "31"
},
{
"last_affected": "31"
},
{
"introduced": "32"
},
{
"last_affected": "32"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-10932",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 429529,
"published_at": "2020-04-15T14:15:20.123+00:00"
}