CVE-2021-23909

6.3 MEDIUM 2% exploit odds No fix listed

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine with an admin-level account. High risk of data tampering, service disruption.
Exploit odds: 2.4% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2021-05-13 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:39 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.4% in the next 30 days (EPSS).
Severity: 6.3 MEDIUM (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2021-05-13 19:15 UTC
Last modified: 2026-06-17 03:39 UTC
Exploit probability: 2.4% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Modified

Affected

mercedes-benz Hermes 2.1

Attack profile CVSS 3.1 · 6.3

Attack vector: Local
Complexity: Low
Privileges needed: High
User interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-23909.md and follow it. Check whether this project is affected by CVE-2021-23909. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record