How severe is CVE-2021-23906?

CVE-2021-23906 has a CVSS 3.x base score of 1.8, rated low severity. It is exploitable over physical access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-23906 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23906?

CVE-2021-23906 affects Mercedes-benz Mercedes-benz User Experience. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23906?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-23906 published?

CVE-2021-23906 was published on 2021-05-13 and last updated on 2026-06-17.

CVE-2021-23906

CVE-2021-23906 is a low-severity vulnerability in Mercedes-benz Mercedes-benz User Experience with a CVSS 3.x base score of 1.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Low (CVSS 3.x base score 1.8)
CVSS v2: 2.1
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Mercedes-benz Mercedes-benz User Experience
Published: 2021-05-13
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-23906?: CVE-2021-23906 has a CVSS 3.x base score of 1.8, rated low severity. It is exploitable over physical access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-23906 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23906?: CVE-2021-23906 affects Mercedes-benz Mercedes-benz User Experience. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23906?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23906 published?: CVE-2021-23906 was published on 2021-05-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mercedes-benz:mercedes-benz_user_experience:*:*:*:*:*:*:*:*

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