MEDIUM
CVE-2021-23906
CWE-20Published: May 13, 2021· Updated: Jun 17, 2026
6.8
CVSS v3.1
Official 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.
Technical Analysis
CVE-2021-23906 requires local access, meaning attackers must already have a foothold on the target system.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.8.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorPhysical
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Vendors & Products
mercedes-benz8 product(s)
mercedes-benz user experiencea 220a 220 4matice 350e 350 4maticeqcgle 350gle 350 4matic
Source: NVD CPE · 8 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (6)
→
→
https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdfExploit · Third Party Advisory
→
https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866Third Party Advisory
→
→
https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdfExploit · Third Party Advisory
→
https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866Third Party Advisory
Quick Facts
CVE IDCVE-2021-23906
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedMay 13, 2021
Related CVEs (CWE-20)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-23906 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.