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Vulnerability · Published May 13, 2025 · Assigned by siemens

CVE-2025-40556

Medium 6.5

In plain English

A medium-severity improper input validation in BACnet ATEC 550-440 from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 83.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
Siemens BACnet ATEC 550-440 0 – before *
Siemens BACnet ATEC 550-441 0 – before *
Siemens BACnet ATEC 550-445 0 – before *
Siemens BACnet ATEC 550-446 0 – before *

Weakness: CWE-20 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References