Exploited CVEs / CVE-2023-4346
CVE-2023-4346
KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-07-29; treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.
Actively exploited KNX Association KNX Protocol Connection Authorization Option 1 vulnerability, High severity, CVSS 7.5. Added to the CISA KEV catalog 2026-07-15.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2023-4346
This is a KNX building automation protocol flaw where the Connection Authorization Option 1 account lockout can be abused to purge all devices and set a BCU key that locks them out permanently, effectively bricking KNX installations that lack extra security options. Anyone running KNX for lighting, HVAC, access control, or other building systems on reachable networks is exposed. CISA added it to the Known Exploited Vulnerabilities catalog on 2026-07-15, so attacks are confirmed despite the modest 1 percent EPSS score, and Severity is High at CVSS 7.5.
Do this: Enable KNX Secure or the additional security options on your KNX devices and restrict KNX bus and IP interfaces to trusted networks only.
AI-generated from public data, 2026-07-22. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2023-4346
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2023-4346
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-07-29.
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.
Official fix for CVE-2023-4346
Check the vendor's security advisory channel for the patched KNX Protocol Connection Authorization Option 1 versions and workarounds.
Common questions about CVE-2023-4346
Is CVE-2023-4346 actively exploited?
Yes. CVE-2023-4346 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-07-15, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is <1%.
What is the CISA deadline and required action for CVE-2023-4346?
CISA set the federal (BOD 22-01) remediation due date at 2026-07-29. The verbatim 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.
What fixes CVE-2023-4346?
Check the vendor's security advisory for the patched KNX Protocol Connection Authorization Option 1 versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2023-4346?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2023-4346's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
