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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.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-10932","reference_id":"","reference_type":"","scores":[{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14525","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14584","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14582","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14646","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14696","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.1477","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14576","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14665","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14725","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14685","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14647","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14591","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14483","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14488","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14553","published_at":"2026-04-21T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-10932"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10932","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10932"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html","reference_id":"","reference_type":"","scores":[],"url":"https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/"},{"reference_url":"https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-released","reference_id":"","reference_type":"","scores":[],"url":"https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-released"},{"reference_url":"https://tls.mbed.org/tech-updates/security-advisories","reference_id":"","reference_type":"","scores":[],"url":"https://tls.mbed.org/tech-updates/security-advisories"},{"reference_url":"https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04","reference_id":"","reference_type":"","scores":[],"url":"https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=963159","reference_id":"963159","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=963159"},{"reference_url":"https://security.archlinux.org/ASA-202007-5","reference_id":"ASA-202007-5","reference_type":"","scores":[],"url":"https://security.archlinux.org/ASA-202007-5"},{"reference_url":"https://security.archlinux.org/AVG-1141","reference_id":"AVG-1141","reference_type":"","scores":[{"value":"Medium","scoring_system":"archlinux","scoring_elements":""}],"url":"https://security.archlinux.org/AVG-1141"},{"reference_url":"https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*","reference_id":"cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*","reference_type":"","scores":[],"url":"https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*"},{"reference_url":"https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","reference_id":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","reference_type":"","scores":[],"url":"https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"}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