How severe is CVE-2021-40327?

CVE-2021-40327 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-40327 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40327?

CVE-2021-40327 affects Trustedfirmware Trusted Firmware-m. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40327?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40327 published?

CVE-2021-40327 was published on 2022-01-13 and last updated on 2026-06-17.

CVE-2021-40327

CVE-2021-40327 is a medium-severity vulnerability in Trustedfirmware Trusted Firmware-m with a CVSS 3.x base score of 5.9. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 2.6
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Trustedfirmware Trusted Firmware-m
Published: 2022-01-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-40327?: CVE-2021-40327 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-40327 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40327?: CVE-2021-40327 affects Trustedfirmware Trusted Firmware-m. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40327?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40327 published?: CVE-2021-40327 was published on 2022-01-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:trustedfirmware:trusted_firmware-m:1.4.0:*:*:*:*:*:*:*

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