CVE-2021-35465

3.4 LOW 0.3% exploit odds Fix listed

What it is

Certain Arm products before 2021-08-23 do not properly consider the effect of exceptions on a VLLDM instruction. A Non-secure handler may have read or write access to part of a Secure context. This affects Arm Cortex-M33 r0p0 through r1p0, Arm Cortex-M35P r0, Arm Cortex-M55 r0p0 through r1p0, and Arm China STAR-MC1 (in the STAR SE configuration).

At a glance

Exploitability: Can be exploited locally on the machine with an admin-level account. Limited direct impact.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-08-23 13:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:57 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 3.4 LOW (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-08-23 13:15 UTC
Last modified: 2026-06-17 03:57 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Record status: Modified

Affected

Arm cortex-m33 Firmware ≤ r1p0
Arm cortex-m35p Firmware r0
Arm cortex-m55 Firmware ≤ r1p0
Arm China star-mc1 Firmware

Attack profile CVSS 3.1 · 3.4

Attack vector: Local
Complexity: Low
Privileges needed: High
User interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-35465.md and follow it. Check whether this project is affected by CVE-2021-35465. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record