What’s Vulnerable › Vulnerabilities

CVE-2021-29415

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-21 · updated 2026-06-17
• Weakness: CWE-203

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.

Affected products

• Nordicsemi Nrf52840 Firmware: through 2021-03-29

References

• https://eprint.iacr.org/2021/640
• https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html
• https://www.sit.fraunhofer.de/en/news-events/downloads-services/cve/
• https://eprint.iacr.org/2021/640
• https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html
• https://www.sit.fraunhofer.de/en/news-events/downloads-services/cve/

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