CVE-2021-43931: Webhmi Firmware

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

The authentication algorithm of the WebHMI portal is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

Affected products

• Webhmi Webhmi Firmware: before 4.1 (fixed in 4.1)

Published 2021-12-06. Last modified 2026-06-17.