What’s Vulnerable › Vulnerabilities

CVE-2020-27211

• Severity: medium (CVSS 5.7 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: none known
• Published: 2021-05-21 · updated 2026-06-17
• Weakness: CWE-203

Description

Nordic Semiconductor nRF52840 devices through 2020-10-19 have improper protection against physical side channels. The flash read-out protection (APPROTECT) can be bypassed by injecting a fault during the boot phase.

Affected products

• Nordicsemi Nrf52840 Firmware: through 2020-10-19

References

• https://eprint.iacr.org/2021/640
• https://infocenter.nordicsemi.com/pdf/in_133_v1.0.pdf
• https://limitedresults.com/2020/06/nrf52-debug-resurrection-approtect-bypass/
• 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://infocenter.nordicsemi.com/pdf/in_133_v1.0.pdf
• https://limitedresults.com/2020/06/nrf52-debug-resurrection-approtect-bypass/
• 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

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