CVE-2020-12061 json
An issue was discovered in Nitrokey FIDO U2F firmware through 1.1.
published 2021-05-21 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4377
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 79%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
1.85% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- eprint.iacr.org https://eprint.iacr.org/2021/640.pdf referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-522 Insufficiently Protected Credentials
References
-
github.com
/Nitrokey/nitrokey-fido-u2f-firmware/commits/master
patch, third-party-advisory
-
eprint.iacr.org
/2021/640.pdf
exploit, third-party-advisory
-
github.com
/Nitrokey/nitrokey-fido-u2f-firmware/releases
third-party-advisory
-
cwe.mitre.org
/data/definitions/523.html
third-party-advisory
Sources
- CVE List CVE-2020-12061
- NVD CVE-2020-12061
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.