CVE-2021-40366: Siemens Climatix POL909 Firmware

High severity, CVSS 7.4. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability has been identified in Climatix POL909 (AWB module) (All versions < V11.42), Climatix POL909 (AWM module) (All versions < V11.34). The web server of affected devices transmits data without TLS encryption. This could allow an unauthenticated remote attacker in a man-in-the-middle position to read sensitive data, such as administrator credentials, or modify data in transit.

Affected products

• Siemens Climatix POL909 Firmware: before 11.34 (fixed in 11.34); before 11.42 (fixed in 11.42)

Published 2021-11-09. Last modified 2026-06-17.