CVE-2025-40556

mediumpriority · track · 0EPSS 0.003 · 16 %ileDEEUNLUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.25% (16th) EPSS
CVSS 6.5 · medium
Is it mine?
560 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · cisa_csaf_ot · ncsc_nl

EPSS · scored 2026-10-27

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

The vendor does not plan to fix this; mitigate or replace.

  • No fix plannedBACnet ATEC 550-440siemens_psirt

    Currently no fix is planned

  • No fix plannedBACnet ATEC 550-441siemens_psirt

    Currently no fix is planned

  • No fix plannedBACnet ATEC 550-445siemens_psirt

    Currently no fix is planned

  • No fix plannedBACnet ATEC 550-446siemens_psirt

    Currently no fix is planned

  • No fix plannedBACnet ATEC 550-440cisa_csaf_ot

    Currently no fix is planned

  • No fix plannedBACnet ATEC 550-441cisa_csaf_ot

    Currently no fix is planned

  • No fix plannedBACnet ATEC 550-445cisa_csaf_ot

    Currently no fix is planned

  • No fix plannedBACnet ATEC 550-446cisa_csaf_ot

    Currently no fix is planned

02

cvss

Technical severity, 0–10. One row per scoring source.

7.1
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–7.1

v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · productcert@siemens.com DEexploitability 2.8 · impact 3.6
v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US
v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Siemens ProductCERT DE
v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · NCSC-NL NL
v4.07.1highCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.07.1highCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · productcert@siemens.com DE
v4.04.9mediumCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USCWE-20USCWE-20USCWE-20US
05

affected products (560)

Products and version ranges known to be affected.

showing 20 of 560
06

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2025-0160Kwetsbaarheden verholpen in Siemens productenNL2025-05-14csaf · ncsc_nlNL

    Siemens heeft kwetsbaarheden verholpen in diverse producten als Apogee, BacNet ATEC, Desigo CC, Intralog, OZW, Polarion, RUGGEDCOM, SICAM, SIMATIC, SIPROTEC, SIRIUS, Teamcenter en Versicharge

  • SSA-828116SSA-828116: Denial of Service Vulnerability in BACnet ATEC Devices2025-05-13csaf · siemens_psirtDE

    BACnet ATEC devices are affected by a denial of service vulnerability that could be triggered by an attacker residing in the same BACnet network by sending a specially crafted MSTP message. A power cycle is required to restore the device's normal operation. Siemens recommends countermeasures for products where fixes are not, or not yet available.

  • ICSA-25-135-03Siemens BACnet ATEC Devices2025-05-13icsa · cisa_csaf_otUS

    BACnet ATEC devices are affected by a denial of service vulnerability that could be triggered by an attacker residing in the same BACnet network by sending a specially crafted MSTP message. A power cycle is required to restore the device's normal operation. Siemens recommends countermeasures for products where fixes are not, or not yet available.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otncsc_nlsiemens_psirtNVDCVE.orgMITRE
published 2025-05-13modified 2026-06-17
09

references (3)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan