Main Vulnerability Database Vulnerabilities #VU116446

Input validation error in Siemens products - CVE-2025-40556

Published: October 3, 2025

Vulnerability identifier: #VU116446

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-40556

CWE-ID: CWE-20

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker on the local network can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Affected software

BACnet ATEC 550-440
BACnet ATEC 550-441
BACnet ATEC 550-445
BACnet ATEC 550-446

How to mitigate CVE-2025-40556

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

External References

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

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