CVE-2021-23909: Mercedes-Benz Hermes

Critical severity, CVSS 9.8. EPSS: 2.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mercedes-Benz Hermes: version 2.1 only

Published 2021-05-13. Last modified 2026-06-17.