CVE-2020-27211
CVE-2020-27211 is a medium-severity vulnerability in Nordicsemi Nrf52840 Firmware with a CVSS 3.x base score of 5.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-203.
Key facts
- Severity: Medium (CVSS 3.x base score 5.7)
- CVSS v2: 3.3
- EPSS exploit prediction: 0% (19th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-203
- Affected product: Nordicsemi Nrf52840 Firmware
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2020-27211?
- 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.
- How severe is CVE-2020-27211?
- CVE-2020-27211 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over physical access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2020-27211 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-27211?
- CVE-2020-27211 affects Nordicsemi Nrf52840 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-27211?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2020-27211 published?
- CVE-2020-27211 was published on 2021-05-21 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:o:nordicsemi:nrf52840_firmware:*:*:*:*:*:*:*:*
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