CVE-2023-4346
Overly Restrictive Account Lockout Mechanism in KNX Association KNX Protocol Connection Authorization Option 1. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 15 July 2026.
- Product
- KNX Association KNX Protocol Connection Authorization Option 1
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- CISA lists none
- Sources
- CISA’s catalog, NVD entry
CISA’s 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.
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.