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

published 2023-04-18 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-29508

cvss: 8.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 21 mo ago (2025-02-05)

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.3	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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
Schneider Electric Merten KNX ARGUS 180/2,20M UP SYSTEM 631725
Schneider Electric Merten Jalousie-/Schaltaktor REG-K/8x/16x/10 m. HB 649908
Schneider Electric Merten KNX Uni-Dimmaktor LL REG-K/2x230/300 W MEG6710-0002
Schneider Electric Merten KNX Schaltakt.2x6A UP m.2 Eing. MEG6003-0002

Classification

Weakness

CWE-287 Improper Authentication

References

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
vendor-advisory

Sources

CVE List CVE-2023-25556
NVD CVE-2023-25556

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary