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CVE-2021-40327

5.9 · MEDIUM

Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control.

Published Jan 13, 2022CWE-862EPSS 1.19%

Overview

CVE-2021-40327 is a medium-severity vulnerability. It was published on January 13, 2022 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control. NSPE can access a secure key (held by the Crypto service) based solely on knowledge of its key ID. For example, there is no authorization check associated with the relationship between a caller and a key owner.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdeveloper.arm.com/support/arm-security-updatesRefgit.trustedfirmware.org/TF-M/trusted-firmware-m.git/Reftf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerability.htmlRefdeveloper.arm.com/support/arm-security-updatesRefgit.trustedfirmware.org/TF-M/trusted-firmware-m.git/Reftf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerability.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-40327?

CVE-2021-40327 is a medium-severity vulnerability. It was published on January 13, 2022 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2021-40327?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-40327?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-40327?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-40327 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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