CVE-2020-12061

Name: CVE-2020-12061
Creator: NVD / NIST
Published: 2021-05-21T12:15:07.613+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.85%

Last modified Jun 17, 2026

CVE-2020-12061 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Nitrokey FIDO U2F firmware through 1.1. Communication between the microcontroller and the secure element transmits credentials in plain. EPSS estimates a 1.85% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.85%

76.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Nitrokey	Fido U2f Firmware	<= 1.1

References

https://cwe.mitre.org/data/definitions/523.htmlThird Party Advisory
https://eprint.iacr.org/2021/640.pdfExploit, Third Party Advisory
https://github.com/Nitrokey/nitrokey-fido-u2f-firmware/commits/masterPatch, Third Party Advisory
https://github.com/Nitrokey/nitrokey-fido-u2f-firmware/releasesThird Party Advisory
https://cwe.mitre.org/data/definitions/523.htmlThird Party Advisory
https://eprint.iacr.org/2021/640.pdfExploit, Third Party Advisory
https://github.com/Nitrokey/nitrokey-fido-u2f-firmware/commits/masterPatch, Third Party Advisory
https://github.com/Nitrokey/nitrokey-fido-u2f-firmware/releasesThird Party Advisory

Timeline

Published: May 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12061?

How severe is CVE-2020-12061?

CVE-2020-12061 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.85% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12061?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-12061?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST