CVE-2023-4346
HIGHCISA KEVDescription
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.
How to fix
Actively exploited, no published fix found yet
Federal remediation due: 2026-07-29
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Moderate risk: more likely to be exploited than 54% of all known CVEs.
Remediation due: 2026-07-29
References
Related Vulnerabilities
Other CWE-645 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-1722 | Low | 3.7 | 0.8% | - | - |
| CVE-2024-37028 | Medium | 5.3 | 0.4% | - | Fix |
| CVE-2025-5241 | Medium | 5.3 | 0.4% | - | - |
| CVE-2026-53982 | Medium | 6.5 | 0.3% | - | - |
| CVE-2025-31947 | Medium | 5.8 | 0.3% | - | Fix |
| CVE-2026-25907 | Medium | 5.3 | 0.3% | - | - |
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-16.