Home / Vulnerabilities / CVE-2023-4346
HIGH SEVERITY
CVE-2023-4346KNX Association · KNX Protocol Connection Authorization Option 1

KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism Vulnerability

Technical Severity

CVSS v3.1 Metrics

HIGH
7.5 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitation Likelihood

EPSS Prediction

1.28 %
Predictive Probability
Percentile Rank
68.0 th

Documented as more likely to be exploited than 68.0% of known CVEs.

Detection Date

Jul 15, 2026

Remediation Due

Jul 29, 2026

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

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.

External Intelligence

CISA

CISA Advisory

https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01

CISA

CISA Advisory

https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk

CISA

CISA Advisory

https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2023-4346