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CVE-2023-4346VulnerabilityPublished 07/15/2026Updated 10/24/2026

CVE-2023-4346: KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism Vulnerability

Affects KNX Association KNX Protocol Connection Authorization Option 1Source CISA KEV

Severity
High

No CVSS score published yet

Exploitation

Actively exploited – in CISA KEV since 07/15/2026

KEV deadline
07/29/2026
EPSS
1.3% chance of exploitation in 30 days – higher than 70% of CVEs

What to do

CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description

KNX Association KNX Protocol Connection Authorization Option 1 contains an overly restrictive account lockout mechanism vulnerability that could allow an attacker to purge all devices without additional security options enabled and set a BCU key to lock the device.

Weaknesses

References

Track KNX Association KNX Protocol Connection Authorization Option 1 with alerts and the API. See plans

Added 10/24/2026 · updated 10/24/2026