HOMEVULNERABILITIESCVE-2020-27212
HIGH

CVE-2020-27212

CWE-74Published: May 21, 2021· Updated: Jun 17, 2026

7.0
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-27212 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.0.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

st95 product(s)
stm32cubel4 firmwarestm32l412c8stm32l412cbstm32l412k8stm32l412kbstm32l412r8stm32l412rbstm32l412t8stm32l412tbstm32l422cbstm32l422kbstm32l422rb+83
Source: NVD CPE · 95 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://eprint.iacr.org/2021/640
ADVISORYhttps://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html
ADVISORYhttps://www.aisec.fraunhofer.de/en/FirmwareProtection.html
ADVISORYhttps://eprint.iacr.org/2021/640
ADVISORYhttps://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html
ADVISORYhttps://www.aisec.fraunhofer.de/en/FirmwareProtection.html

All References (6)

→
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

Quick Facts

CVE IDCVE-2020-27212
CVSS Score7.0 / 10
SeverityHIGH
WeaknessCWE-74
CISA KEVNo
Affected1 vendor(s)
PublishedMay 21, 2021

Related CVEs (CWE-74)

CVE-2020-26282
10.0
CVE-2026-56699
10.0
CVE-2026-44182
10.0
CVE-2024-42472
10.0
CVE-2022-24760
10.0
CVE-2014-8423
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-27212 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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