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Vulnerability record · CVE-2021-40327 · published 13 January 2022

CVE-2021-40327: Trustedfirmware trusted firmware-m missing authorization vulnerability

Trustedfirmware · Trusted Firmware M

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.

5.9 CVSS 3.1 Medium EPSS 1.2% · top 33.2% CWE-862 · Missing authorization
5.9CVSS 3.1 base score, v2 2.6
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://developer.arm.com/support/arm-security-updates Third Party Advisory
https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/ PatchVendor Advisory
https://tf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerabilit PatchVendor Advisory
https://developer.arm.com/support/arm-security-updates Third Party Advisory
https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/ PatchVendor Advisory
https://tf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerabilit PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-40327), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.