What it is
CVE-2023-4346 is an unauthenticated vulnerability affecting KNX Association KNX Protocol Connection Authorization Option 1. KNX devices that use KNX Connection Authorization and support Option 1 are, depending on the...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2023-4346
KNX Protocol Connection Authorization Option 1
KNX Association / KNX Protocol Connection Authorization Option 1 · 0
- Severity
- CVSS 7.5 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 0.9%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
KNX Association / KNX Protocol Connection Authorization Option 1 0.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
KNX Protocol Connection Authorization Option 1
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.
Vendor
Product
Affected
Status
KNX Association
KNX Protocol Connection Authorization Option 1
0
Affected
- Published
- 29 Aug 2023
- Exploitation Reported
- 15 Jul 2026
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- None
Tags
cisa
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2023-4346
- Government Resource — cisa.gov cisa.gov · Government Resource https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| All CISA Advisories First | 2026-07-15 12:00 UTC |
| CISA | 2026-07-15 16:42 UTC |
| CVE | 2026-07-15 18:01 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
7.5
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.9%
Recent mention · All CISA Advisories
CISA Adds Two Known Exploited Vulnerabilities to Catalog
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2023-4346 KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism...
Read full advisoryTimeline
From disclosure to observed exploitation
-
KEV confirmed by CVE
Exploitation attested by an external source
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2023-4346
Free JSON includes basic KEV fields{
"cve_id": "CVE-2023-4346",
"confidence": "Confirmed",
"cvss_score": 7.5,
"cvss_estimated": false,
"epss_score": 0.00907,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
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