What’s Vulnerable › Vulnerabilities

CVE-2020-27208

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-21 · updated 2026-06-17
• Weakness: CWE-326

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.

Affected products

• Nitrokey Fido2 Firmware: all versions
• Solokeys Solo Firmware: 4.0.0
• Solokeys Somu Firmware: all versions

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
• https://www.aisec.fraunhofer.de/en/FirmwareProtection.html
• 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
• https://www.aisec.fraunhofer.de/en/FirmwareProtection.html

Get alerted when CVE-2020-27208 or the next vulnerability affects your stack