CVE-2020-27208

Name: CVE-2020-27208
Creator: NVD / NIST
Published: 2021-05-21T12:15:07.663+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2020-27208 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.8/10

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

EPSS Probability

0.33%

24.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-326

Affected Software

Vendor	Product	Versions
Solokeys	Solo Firmware	4.0.0
Solokeys	Somu Firmware	All versions
Nitrokey	Fido2 Firmware	All versions

References

https://eprint.iacr.org/2021/640Third Party Advisory
https://github.com/solokeys/solo/commit/a9c02cd354f34b48195a342c7f524abdef5cbcecPatch, Third Party Advisory
https://solokeys.comProduct
https://twitter.com/SoloKeysSecProduct
https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.htmlThird Party Advisory
https://www.aisec.fraunhofer.de/en/FirmwareProtection.htmlExploit, Third Party Advisory
https://eprint.iacr.org/2021/640Third Party Advisory
https://github.com/solokeys/solo/commit/a9c02cd354f34b48195a342c7f524abdef5cbcecPatch, Third Party Advisory
https://solokeys.comProduct
https://twitter.com/SoloKeysSecProduct
https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.htmlThird Party Advisory
https://www.aisec.fraunhofer.de/en/FirmwareProtection.htmlExploit, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2020-27208?

How severe is CVE-2020-27208?

CVE-2020-27208 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27208?

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-2020-27208?

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

Scan your code now

Source: NVD / NIST