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    CVE-2021-40327

    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.

    Published:Jan 13, 2022
    Last Modified:Jun 5, 2026
    EPS:Jan 13, 2022
    EPSS Score:0.0033
    CVSS Score:5.9

    Affected Products

    Vendor
    Trustedfirmware
    Product
    Trusted Firmware-m

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

    CVE-2026-54467 (CVSS 7) — On the Trusted Firmware-M (TF-M) 2 through 2.3.0 platform before 00d1b3e, mailbox initialization on PSOC64 and…
    CVE-2025-53022 (CVSS 8.6) — TrustedFirmware-M (aka Trusted Firmware for M profile Arm CPUs) before 2.1.3 and 2.2.x before 2.2.1 lacks leng…
    CVE-2024-45746 (CVSS 9.8) — An issue was discovered in Trusted Firmware-M through 2.1.0. User provided (and controlled) mailbox messages c…
    CVE-2023-51712 (CVSS 4.7) — An issue was discovered in Trusted Firmware-M through 2.0.0. The lack of argument verification in the logging …
    CVE-2023-40271 (CVSS 7.5) — In Trusted Firmware-M through TF-Mv1.8.0, for platforms that integrate the CryptoCell accelerator, when the Cr…
    CVE-2021-43619 (CVSS 7.8) — Trusted Firmware M 1.4.x through 1.4.1 has a buffer overflow issue in the Firmware Update partition. In the IP…
    CVE-2021-27562 (CVSS 5.5) — In Arm Trusted Firmware M through 1.2, the NS world may trigger a system halt, an overwrite of secure data, or…
    CVE-2021-32032 (CVSS 7.5) — In Trusted Firmware-M through 1.3.0, cleaning up the memory allocated for a multi-part cryptographic operation…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High