CVE-2023-25556

Device compromise via undersized authentication keys

Published Apr 18, 2023 · Updated Feb 5, 2025

Improper authentication in Schneider Electric Merten KNX devices allows attackers with KNX installation access to compromise a device. The devices accept an entered key shorter than seven digits instead of enforcing the minimum key length. Access to the KNX installation is required; compromise permits limited information disclosure, device alteration, and service interruption.

CVSS severity8.3
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Schneider Electric Merten KNX devices allows attackers with KNX installation access to compromise a device. The devices accept an entered key shorter than seven digits instead of enforcing the minimum key length. Access to the KNX installation is required; compromise permits limited information disclosure, device alteration, and service interruption.

The record

CVE
CVE-2023-25556
Published
Apr 18, 2023
Updated
Feb 5, 2025
Vendor
Distributed Data Systems
Product
KNX Switching Actuator 2-Gang 6 A Flush-Mounted with 2 Inputs
Classifications
CWE-287
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Program Version 0.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Distributed Data Systems · KNX Switching Actuator 2-Gang 6 A Flush-Mounted with 2 Inputsversion=Program Version 0.1
Distributed Data Systems · KNX Blind/Switch Actuator REG-K/8x/16x/10 A with Manual Operationversion=Program Version 1.0
Distributed Data Systems · KNX Push-Button Module, 2-Gang, System Mversion=Program Version 1.0
Distributed Data Systems · KNX Universal Dimming Actuator LL REG-K/2x230/300 Wversion=Program Version 1.0; version=Program Version 1.1
Distributed Data Systems · KNX Push-Button Interface, 4-Gang Plusversion=Program Version 1.0; version=Program Version 1.2
Distributed Data Systems · KNX Push-Button Module, 1-Gang, System Mversion=Program Version 1.0
Distributed Data Systems · KNX ARGUS 180/2.20 m Flush-Mounted, System Mversion=Program Version 1.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3Schneider ElectricCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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