What is CVE-2021-23906?

CVE-2021-23906 is a low-severity vulnerability in Mercedes-Benz A 220, classified under Improper Input Validation. CVSS score: 1.8/10. Published 2021-05-13.

How severe is CVE-2021-23906?

Low severity. CVSS v3 base score is 1.8 out of 10.

Improper input validation in Mercedes-Benz A 220

CVE-2021-23906

An issue was discovered in the Headunit NTG6 in the MBUX Infotainment System on Mercedes-Benz vehicles through 2021. A Message Length is not checked in the HiQnet Protocol, leading to remote code execution.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 1.8 (Low). Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

media.daimler.com/marsMediaSite/en/instance/ko.xhtml (Third Party Advisory)
keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Securi… (Third Party Advisory)
keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-23906?: CVE-2021-23906 is a low-severity vulnerability in Mercedes-Benz A 220, classified under Improper Input Validation. CVSS score: 1.8/10. Published 2021-05-13.
How severe is CVE-2021-23906?: Low severity. CVSS v3 base score is 1.8 out of 10.