What is CVE-2025-40556?

CVE-2025-40556 is a medium-severity vulnerability in Siemens Bacnet Atec 550-440, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2025-05-13.

How severe is CVE-2025-40556?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Siemens Bacnet Atec 550-440

CVE-2025-40556

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 BAC…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.002 (10.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Siemens Bacnet Atec 550-440 — versions 0
Siemens Bacnet Atec 550-441 — versions 0
Siemens Bacnet Atec 550-445 — versions 0
Siemens Bacnet Atec 550-446 — versions 0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

productcert@siemens.com

Frequently asked questions

What is CVE-2025-40556?: CVE-2025-40556 is a medium-severity vulnerability in Siemens Bacnet Atec 550-440, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2025-05-13.
How severe is CVE-2025-40556?: Medium severity. CVSS v3 base score is 6.5 out of 10.