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Vulnerability Details :

CVE-2023-4346

Summary
Assigner-icscert
Assigner Org ID-7d14cffa-0d7d-4270-9dc0-52cabd5a23a6
Published At-29 Aug, 2023 | 19:38
Updated At-16 Jul, 2026 | 03:55
Rejected At-
Credits

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Known Exploited Vulnerabilities (KEV)
cisa.gov
Vendor:
KNX Association
Product:KNX Protocol Connection Authorization Option 1
Added At:15 Jul, 2026
Due At:29 Jul, 2026

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.

Used in Ransomware

:

Unknown

CWE

:
CWE-645

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.

Additional Notes:

https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2023-4346
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:icscert
Assigner Org ID:7d14cffa-0d7d-4270-9dc0-52cabd5a23a6
Published At:29 Aug, 2023 | 19:38
Updated At:16 Jul, 2026 | 03:55
Rejected At:
▼CVE Numbering Authority (CNA)

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.

Affected Products
Vendor
KNX Association
Product
KNX Protocol Connection Authorization Option 1
Default Status
unaffected
Versions
Affected
  • 0
Problem Types
TypeCWE IDDescription
CWECWE-645CWE-645 Overly Restrictive Account Lockout Mechanism
Type: CWE
CWE ID: CWE-645
Description: CWE-645 Overly Restrictive Account Lockout Mechanism
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds

The KNX Association recommends users always set the BCU Key in every KNX Project that is already finished and will be commissioned in the future. Handover the BCU Key as part of the Project Documentation to the Building Owner.

Exploits
Credits
reporter
Felix Eberstaller
finder
Limes Security
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01
government-resource
Hyperlink: https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01
Resource:
government-resource
▼Authorized Data Publishers (ADP)
1. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01
government-resource
x_transferred
Hyperlink: https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01
Resource:
government-resource
x_transferred
2. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
kev
dateAdded:
2026-07-15
reference:
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
CVE-2023-4346 added to CISA KEV2026-07-15 00:00:00
Event: CVE-2023-4346 added to CISA KEV
Date: 2026-07-15 00:00:00
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346
government-resource
Hyperlink: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346
Resource:
government-resource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:ics-cert@hq.dhs.gov
Published At:29 Aug, 2023 | 20:15
Updated At:16 Jul, 2026 | 05:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
2026-07-152026-07-29KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism VulnerabilityApply 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.
Date Added: 2026-07-15
Due Date: 2026-07-29
Vulnerability Name: KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism Vulnerability
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.
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A
Type: Secondary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Type: Primary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches
knx
knx
>>connection_authorization>>-
cpe:2.3:a:knx:connection_authorization:-:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-645Secondaryics-cert@hq.dhs.gov
CWE ID: CWE-645
Type: Secondary
Source: ics-cert@hq.dhs.gov
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01ics-cert@hq.dhs.gov
Third Party Advisory
US Government Resource
https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346134c704f-9b21-4f2e-91b3-4a467353bcc0
US Government Resource
Hyperlink: https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01
Source: ics-cert@hq.dhs.gov
Resource:
Third Party Advisory
US Government Resource
Hyperlink: https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
US Government Resource
Hyperlink: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
US Government Resource

Change History

0
Information is not available yet

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ShareView Details
Matching Score-4
Assigner-Dell
CVSS Score-5.3||MEDIUM
EPSS-0.26% / 17.80%
||
7 Day CHG~0.00%
Published-04 Mar, 2026 | 13:06
Updated-04 Mar, 2026 | 20:45
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Dell PowerScale OneFS, version 9.13.0.0, contains an overly restrictive account lockout mechanism vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to denial of service.

Action-Not Available
Vendor-Dell Inc.
Product-powerscale_onefsPowerScale OneFS
CWE ID-CWE-645
Overly Restrictive Account Lockout Mechanism
Details not found