What is CVE-2020-12061?

CVE-2020-12061 is a critical-severity vulnerability in Nitrokey Fido U2f, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2021-05-21.

How severe is CVE-2020-12061?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-12061 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Nitrokey Fido U2f

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.

EPSS: 0.019 (77.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

Public proof-of-concept exploits

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-12061?: CVE-2020-12061 is a critical-severity vulnerability in Nitrokey Fido U2f, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2021-05-21.
How severe is CVE-2020-12061?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-12061 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.