CVE-2020-27208

6.8 mediumEPSS 0.3%

Medium (6.8). EPSS 0.3% chance of exploitation in the next 30 days.

The flash read-out protection (RDP) level is not enforced during the device initialization phase of the SoloKeys Solo 4.0.0 & Somu and the Nitrokey FIDO2 token. This allows an adversary to downgrade the RDP level and access secrets such as private ECC keys from SRAM via the debug interface.

Severity

CVSS 3.1

6.8 medium

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 25% of CVEs (scores of 2026-10-31)
CWE: CWE-326
Published: 2021-05-21
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

nitrokey:fido2_firmware
solokeys:solo_firmware
solokeys:somu_firmware

References

https://eprint.iacr.org/2021/640
https://github.com/solokeys/solo/commit/a9c02cd354f34b48195a342c7f524abdef5cbcec
https://solokeys.com
https://twitter.com/SoloKeysSec
https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html

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