CVE-2021-41545 Denial of service in Desigo DXR2

What is CVE-2021-41545?

CVE-2021-41545 is a high-severity denial of service vulnerability in Siemens Desigo DXR2, published on 10 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-248

Which versions are affected by CVE-2021-41545?

It affects 4 products.

Products include Siemens Desigo Dxr2 Firmware, Siemens Desigo Pxc3 Firmware, Siemens Desigo Pxc4 Firmware, Siemens Desigo Pxc5 Firmware.

How do I fix CVE-2021-41545?

No fix has been published for CVE-2021-41545 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-41545 being exploited?

There is no known exploitation of CVE-2021-41545 in the wild and no public exploit code.

Other vulnerabilities in Siemens Desigo DXR2

• CVE-2022-24042 Auth bypass in Desigo DXR2 Critical 9.1
• CVE-2022-24044 Auth bypass in Desigo DXR2 High 7.5
• CVE-2022-24040 Denial of service in Desigo DXR2 Medium 6.5
• CVE-2022-24041 Weak cryptography in Desigo DXR2 Medium 6.5
• CVE-2022-24045 Information disclosure in Desigo DXR2 Medium 6.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-hw79-77g6-22xq.