How severe is CVE-2020-12061?

CVE-2020-12061 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-12061 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12061?

CVE-2020-12061 affects Nitrokey Fido U2f Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-12061?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-12061 published?

CVE-2020-12061 was published on 2021-05-21 and last updated on 2026-06-17.

CVE-2020-12061

CVE-2020-12061 is a critical-severity vulnerability in Nitrokey Fido U2f Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Nitrokey Fido U2f Firmware
Published: 2021-05-21
Last modified: 2026-06-17

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.

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.
How severe is CVE-2020-12061?: CVE-2020-12061 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-12061 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12061?: CVE-2020-12061 affects Nitrokey Fido U2f Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-12061?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-12061 published?: CVE-2020-12061 was published on 2021-05-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:nitrokey:fido_u2f_firmware:*:*:*:*:*:*:*:*

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