CVE-2021-41545: Siemens Desigo DXR2 Firmware

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

A vulnerability has been identified in Desigo DXR2 (All versions < V01.21.142.5-22), Desigo PXC3 (All versions < V01.21.142.4-18), Desigo PXC4 (All versions < V02.20.142.10-10884), Desigo PXC5 (All versions < V02.20.142.10-10884). When the controller receives a specific BACnet protocol packet, an exception causes the BACnet communication function to go into a “out of work” state and could result in the controller going into a “factory reset” state.

Affected products

• Siemens Desigo DXR2 Firmware: before 01.21.142.5-22 (fixed in 01.21.142.5-22)
• Siemens Desigo PXC3 Firmware: before 01.21.142.4-18 (fixed in 01.21.142.4-18)
• Siemens Desigo PXC4 Firmware: before 02.20.142.10-10884 (fixed in 02.20.142.10-10884)
• Siemens Desigo PXC5 Firmware: before 02.20.142.10-10884 (fixed in 02.20.142.10-10884)

Published 2022-05-10. Last modified 2026-06-17.