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),...
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.
Classification
CVE ID: CVE-2025-40556
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.5
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Problem Types
CWE-20: Improper Input ValidationAffected Products
Vendor: Siemens
Product: BACnet ATEC 550-440, BACnet ATEC 550-441, BACnet ATEC 550-445, BACnet ATEC 550-446
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.02% (probability of being exploited)
EPSS Percentile: 4.12% (scored less or equal to compared to others)
EPSS Date: 2025-06-11 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-40556https://cert-portal.siemens.com/productcert/html/ssa-828116.html