Exploited vulnerabilities / CVE-2023-4346
Confirmed exploited · exploited vulnerability · KNX Protocol Connection Authorization Option 1CVE-2023-4346
KNX Protocol Connection Authorization Option 1 exploited vulnerability, confirmed exploited in the wild.
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.
| CISA's name for it | KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism Vulnerability |
|---|---|
| Vendor and product | KNX Association · KNX Protocol Connection Authorization Option 1 |
| Type | exploited vulnerability · CWE-645 |
| Exploited | Confirmed by CISA listed 15 July 2026 |
| Likelihood | scored lower by EPSS, but already confirmed exploited, which outranks any prediction |
| Deadline | 29 July 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | www.cisa.gov ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.
If you cannot patch now, restrict network access to the affected product.
Check for signs of compromise since the date it was added to the list.
| CISA's required action | Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |
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Know before someone else finds it
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CVE-2023-4346 in short
Is CVE-2023-4346 being exploited?
Yes. CISA added CVE-2023-4346 to its Known Exploited Vulnerabilities catalogue on 15 July 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2023-4346?
US federal agencies must remediate it by 29 July 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2023-4346 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 1.4%, the 72nd percentile of every CVE it scores.
How do I fix CVE-2023-4346?
Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.