{"id":"CVE-2021-29415","aliases":["EUVD-2021-16050","GHSA-738r-q8gh-xrrc"],"status":"published","title":"The elliptic curve cryptography (ECC) hardware accelerator, part of the ARM® TrustZone®...","description":"The elliptic curve cryptography (ECC) hardware accelerator, part of the ARM® TrustZone® CryptoCell 310, contained in the NordicSemiconductor nRF52840 through 2021-03-29 has a non-constant time ECDSA implemenation. This allows an adversary to recover the private ECC key used during an ECDSA operation.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00273,"percentile":0.19862,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-203"],"published":"2021-05-21T11:29:59Z","modified":"2026-06-17T03:47:35Z","products":[{"vendor":"nordicsemi","product":"nrf52840_firmware"}],"references":[{"url":"https://www.sit.fraunhofer.de/en/news-events/downloads-services/cve/","tags":["x_refsource_MISC","x_transferred","Not Applicable"]},{"url":"https://eprint.iacr.org/2021/640","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29415"},{"url":"https://github.com/advisories/GHSA-738r-q8gh-xrrc"}],"sources":{"cve":[{"id":"CVE-2021-29415","description":"The elliptic curve cryptography (ECC) hardware accelerator, part of the ARM® TrustZone® CryptoCell 310, contained in the NordicSemiconductor nRF52840 through 2021-03-29 has a non-constant time ECDSA implemenation. This allows an adversary to recover the private ECC key used during an ECDSA operation.","status":"published","published":"2021-05-21T11:29:59Z","modified":"2024-08-03T22:02:51.779Z","updated_at":"2026-11-02T14:33:06.32268Z"}],"euvd":[{"id":"EUVD-2021-16050","description":"The elliptic curve cryptography (ECC) hardware accelerator, part of the ARM® TrustZone® CryptoCell 310, contained in the NordicSemiconductor nRF52840 through 2021-03-29 has a non-constant time ECDSA implemenation. This allows an adversary to recover the private ECC key used during an ECDSA operation.","status":"published","published":"2021-05-21T11:29:59Z","modified":"2024-08-03T22:02:51Z","updated_at":"2026-11-03T03:24:45.000012Z"}],"ghsa":[{"id":"GHSA-738r-q8gh-xrrc","title":"The elliptic curve cryptography (ECC) hardware accelerator, part of the ARM® TrustZone®...","description":"The elliptic curve cryptography (ECC) hardware accelerator, part of the ARM® TrustZone® CryptoCell 310, contained in the NordicSemiconductor nRF52840 through 2021-03-29 has a non-constant time ECDSA implemenation. This allows an adversary to recover the private ECC key used during an ECDSA operation.","status":"published","published":"2022-05-24T22:28:21Z","modified":"2023-01-27T05:04:21Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T14:42:26.749233Z"}],"nvd":[{"id":"CVE-2021-29415","description":"The elliptic curve cryptography (ECC) hardware accelerator, part of the ARM® TrustZone® CryptoCell 310, contained in the NordicSemiconductor nRF52840 through 2021-03-29 has a non-constant time ECDSA implemenation. This allows an adversary to recover the private ECC key used during an ECDSA operation.","status":"published","published":"2021-05-21T12:15:07.953Z","modified":"2026-06-17T03:47:35.837Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:P/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:06:53.987491Z"}]}}