CVE-2021-41545

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-05-10 · updated 2026-06-17
Weakness: CWE-248

Description

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

How to fix

Upgrade to a fixed version: Siemens Desigo Dxr2 Firmware 01.21.142.5-22; Siemens Desigo Pxc3 Firmware 01.21.142.4-18; Siemens Desigo Pxc4 Firmware 02.20.142.10-10884; Siemens Desigo Pxc5 Firmware 02.20.142.10-10884. Check the vendor advisory for mitigations.

References

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