CVE-2023-25556

HIGH
8.8
CVSS Score
Published: April 18, 2023 at 05:03 PM UTC
Updated: June 17, 2026 at 05:41 AM UTC
14 products affected across 1 vendorMerten Instabus Tastermodul 2FACH System M FirmwareMerten Instabus Tastermodul 1FACH System M FirmwareMerten Tasterschnittstelle 4FACH Plus Firmware

Using Merten INSTABUS Tastermodul 1fach System M 625199 by Schneider Electric?

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

schneider-electric-merten-instabus-tastermodul-1fach-system-m (same device)
schneider-electric-merten-instabus-tastermodul-2fach-system-m (same device)
schneider-electric-merten-jalousie-schaltaktor-reg-k-8x-16x-10-m-hb (same device)
schneider-electric-merten-knx-argus-180-2-20m-up-system (same device)
schneider-electric-merten-knx-schaltakt-2x6a-up-m-2-eing (same device)
schneider-electric-merten-knx-uni-dimmaktor-ll-reg-k-2x230-300-w (same device)
schneider-electric-merten-tasterschnittstelle-4fach-plus (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

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