CVE-2020-27211

Name: CVE-2020-27211
Creator: NVD / NIST
Published: 2021-05-21T13:15:07.627+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.7/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2020-27211 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. 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.. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.7/10

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

EPSS Probability

0.28%

19.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Nordicsemi	Nrf52840 Firmware	<= 2020-10-19

References

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

Timeline

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

Frequently Asked Questions

What is CVE-2020-27211?

How severe is CVE-2020-27211?

CVE-2020-27211 has a CVSS score of 5.7/10 (MEDIUM severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27211?

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-2020-27211?

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

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Source: NVD / NIST