{"cve":"CVE-2023-4346","nvd":{"published":"2023-08-29T20:15:10.300","modified":"2026-07-16T05:16:16.603","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-645"],"references":["https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01","https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346"],"products":["knx:connection_authorization"],"source":"nvd","synced_at":"2026-10-19T21:39:14.809778102+00:00"},"epss":{"cve":"CVE-2023-4346","score":0.01363,"percentile":0.71792,"date":"2026-10-31"},"kev":{"cve":"CVE-2023-4346","date_added":"2026-07-15","due_date":"2026-07-29","vendor":"KNX Association","product":"KNX Protocol Connection Authorization Option 1","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}