What is CVE-2021-43619?

CVE-2021-43619 is a high-severity vulnerability in Trustedfirmware Trusted Firmware-M, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2022-03-01.

How severe is CVE-2021-43619?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Trustedfirmware Trusted Firmware-M

CVE-2021-43619

Trusted Firmware M 1.4.x through 1.4.1 has a buffer overflow issue in the Firmware Update partition. In the IPC model, a psa_fwu_write caller from SPE or NSPE can overwrite stack memory locations.

Vulnerability class: Buffer Overflow

Published 2022-03-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.2th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Trustedfirmware Trusted Firmware-M — versions 1.4.0, 1.4.1

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

developer.arm.com/support/arm-security-updates (Vendor Advisory)
www.trustedfirmware.org (Product)
git.trustedfirmware.org/TF-M/trusted-firmware-m.git/ (Patch, Third Party Advisory)
tf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/fwu_write… (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-43619?: CVE-2021-43619 is a high-severity vulnerability in Trustedfirmware Trusted Firmware-M, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2022-03-01.
How severe is CVE-2021-43619?: High severity. CVSS v3 base score is 7.8 out of 10.