CVE-2020-27212

low-risk
Published 2021-05-21

STMicroelectronics STM32L4 devices through 2020-10-19 have incorrect access control. The flash read-out protection (RDP) can be degraded from RDP level 2 (no access via debug interface) to level 1 (limited access via debug interface) by injecting a fault during the boot phase.

Do I need to act?

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0.10% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.0/10 High
LOCAL / HIGH complexity

Affected Products (1)

Stm32Cubel4 Firmware

Affected Vendors

St

References (6)

Third Party Advisory https://eprint.iacr.org/2021/640
Third Party Advisory https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/secu...
Third Party Advisory https://www.aisec.fraunhofer.de/en/FirmwareProtection.html
Third Party Advisory https://eprint.iacr.org/2021/640
Third Party Advisory https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/secu...
Third Party Advisory https://www.aisec.fraunhofer.de/en/FirmwareProtection.html
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal