CVE-2025-40556

Description

A vulnerability has been identified in BACnet ATEC 550-440 (All versions), BACnet ATEC 550-441 (All versions), BACnet ATEC 550-445 (All versions), BACnet ATEC 550-446 (All versions). Affected devices improperly handle specific incoming BACnet MSTP messages. This could allow an attacker residing in the same BACnet network to send a specially crafted MSTP message that results in a denial of service condition of the targeted device. A power cycle is required to restore the device's normal operation.

References

Link	Tags
https://cert-portal.siemens.com/productcert/html/ssa-828116.html

Frequently Asked Questions

What is the severity of CVE-2025-40556?: CVE-2025-40556 has been scored as a high severity vulnerability.
How to fix CVE-2025-40556?: To fix CVE-2025-40556, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-40556 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-40556 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-40556?: CVE-2025-40556 affects Siemens BACnet ATEC 550-440, Siemens BACnet ATEC 550-441, Siemens BACnet ATEC 550-445, Siemens BACnet ATEC 550-446.

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Description

Category

CWE-20 – Improper Input Validation

References

Frequently Asked Questions