Vulnerability Monitor

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CVE-2021-23909

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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.3, requiring local system access to exploit with relatively low complexity without requiring user interaction . The vulnerability impacts limited data confidentiality, integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 8 products from mercedes-benz, from mercedes-benz, from mercedes-benz and 5 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-05-13T19:15:07.870

Last Modified

2024-11-21T05:52:02.513

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Primary
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mercedes-benz	hermes	2.1	Yes
Hardware	mercedes-benz	a_220	-	No
Hardware	mercedes-benz	a_220_4matic	-	No
Hardware	mercedes-benz	e_350	-	No
Hardware	mercedes-benz	e_350_4matic	-	No
Hardware	mercedes-benz	eqc	-	No
Hardware	mercedes-benz	gle_350	-	No
Hardware	mercedes-benz	gle_350_4matic	-	No

References

https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/ Third Party Advisory ([email protected])
https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf Exploit, Third Party Advisory ([email protected])
https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866 Third Party Advisory ([email protected])
https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For mercedes-benz's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.