CVE-2020-12061
CVSS v3
9.8
CRITICAL
EPSS Score
1.9 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
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.
Technical details
- Published
- 2021-05-21
Frequently asked questions
What is CVE-2020-12061?
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.
Is CVE-2020-12061 actively exploited?
Active exploitation of CVE-2020-12061 has not been confirmed. Its EPSS score was 1.9% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2020-12061?
CVE-2020-12061 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2020-12061 affecting your environment?
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