CVE-2023-4346: KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
CSIRTS triage
- What
- An overly restrictive account lockout mechanism vulnerability could allow an attacker to purge all devices.
- Who is affected
- Deployments using the KNX Protocol Connection Authorization Option 1 are affected.
- Urgency
- Remediation is urgent as this vulnerability is actively exploited and poses significant risks.
- Action
- Implement security measures to mitigate the risk associated with this vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch KNX Protocol Connection Authorization Option 1
Get an email when a new KNX Protocol Connection Authorization Option 1 advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-4346
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2023-4346Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 56% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2023-4346 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploitedCISA Adds Two Known Exploited Vulnerabilities to Catalogcisa
More from CISA Known Exploited Vulnerabilities
- criticalCVE-2026-20316: Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability2026-07-29
- criticalCVE-2025-68686: Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability2026-07-27
- criticalCVE-2026-16812: Arista VeloCloud Orchestrator On-Prem OS Command Injection Vulnerability2026-07-27
- criticalCVE-2026-16232: Check Point SmartConsole Improper Authentication Vulnerability2026-07-22
- criticalCVE-2026-50522: Microsoft SharePoint Deserialization of Untrusted Data Vulnerability2026-07-22