CVE-2020-27212

Name: CVE-2020-27212
Creator: NVD / NIST
Published: 2021-05-21T12:15:07.73+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2020-27212 is a high-severity vulnerability rated 7/10 on the CVSS scale. 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.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7/10

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

EPSS Probability

0.34%

26.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
St	Stm32cubel4 Firmware	<= 1.16.0

References

https://eprint.iacr.org/2021/640Third 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://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-2020-27212?

How severe is CVE-2020-27212?

CVE-2020-27212 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27212?

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-2020-27212?

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

Scan your code now

Source: NVD / NIST