CVE-2020-12061: Nitrokey Fido u2f Firmware

Critical severity, CVSS 9.8. EPSS: 1.9% chance of exploitation in the next 30 days.

An issue was discovered in Nitrokey FIDO U2F firmware through 1.1. Communication between the microcontroller and the secure element transmits credentials in plain. This allows an adversary to eavesdrop the communication and derive the secrets stored in the microcontroller. As a result, the attacker is able to arbitrarily manipulate the firmware of the microcontroller.

Affected products

• Nitrokey Fido u2f Firmware: up to and including 1.1

Published 2021-05-21. Last modified 2026-06-17.