How severe is CVE-2020-27212?

CVE-2020-27212 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-27212 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27212?

CVE-2020-27212 affects St Stm32cubel4 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27212?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-27212 published?

CVE-2020-27212 was published on 2021-05-21 and last updated on 2026-06-17.

CVE-2020-27212

CVE-2020-27212 is a high-severity vulnerability in St Stm32cubel4 Firmware with a CVSS 3.x base score of 7.0. 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-74.

Key facts

Severity: High (CVSS 3.x base score 7.0)
CVSS v2: 4.4
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: St Stm32cubel4 Firmware
Published: 2021-05-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-27212?: 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.
How severe is CVE-2020-27212?: CVE-2020-27212 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-27212 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27212?: CVE-2020-27212 affects St Stm32cubel4 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27212?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-27212 published?: CVE-2020-27212 was published on 2021-05-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:st:stm32cubel4_firmware:*:*:*:*:*:*:*:*

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