MediumFix available
mbedtls — 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
- mbedtls
- Affected versions
- Not specified
- Fixed versions
- 2.16.6-r0
- CVEs
- CVE-2020-10932
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:00 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:ALPINE-CVE-2020-10932
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
mbedtls
Fixed versions: 2.16.6-r0
Complete source record
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"url": "https://osv.dev/vulnerability/ALPINE-CVE-2020-10932",
"method": "structured",
"payload": {
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"title": "ALPINE-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.",
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],
"modified": "2026-10-26T11:17:55.097937831Z",
"provider": "osv",
"upstream": [
"CVE-2020-10932"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-10932"
]
},
"related_cves": [
{
"value": "CVE-2020-10932",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450342,
"published_at": "2020-04-15T14:15:20.123+00:00"
}