Risk Letters

Exploited vulnerability

CVE-2023-4346

TLP:CLEAR

KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism Vulnerability

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.

Facts

  • Vendor: KNX Association
  • Product: KNX Protocol Connection Authorization Option 1
  • CVSS: 7.5
  • EPSS (probability of exploitation within 30 days): 1.4 %
  • On CISA's Known Exploited Vulnerabilities list since: 15 July 2026
  • First known exploitation: 15 July 2026
  • CISA's deadline for US federal agencies: 29 July 2026
  • Weakness: CWE-645
  • First seen by Risk Letters: 15 July 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD