CVE-2023-4346High· 7.5▾ Abyssal⚠ Exploited in the wildKNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the device…
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 41.3 · likelihood 0.3 · exploitation 25
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Exploit-prediction probability, daily snapshots since Jul 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
Federal remediation due Jul 29, 2026
0.5%
0.5% → 1.3%
Added to the CISA catalog on Jul 15, 2026. Federal remediation due Jul 29, 2026. View catalog ↗
KNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way.
connection_authorizationRefer to the linked advisories for vendor-supplied fixes and affected version ranges.