CVE-2023-4346
KNX Association KNX Protocol Connection Authorization Option 1 Overly Restrictive Account Lockout Mechanism Vulnerability - [Actively Exploited]
Description
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.
INFO
Published Date :
Aug. 29, 2023, 8:15 p.m.
Last Modified :
July 16, 2026, 5:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been 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.
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.
Unknown
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
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Public PoC/Exploit Available at Github
CVE-2023-4346 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-4346.
| URL | Resource |
|---|---|
| https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01 | Third Party Advisory US Government Resource |
| https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01 | Third Party Advisory US Government Resource |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-4346 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-4346
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Provenance-first OSINT/security intelligence feed CLI. Every item ships a real source URL, a real timestamp, and an explicit live/fallback flag -- CISA-KEV, Cloudflare Radar, Reddit, Telegram, and GDELT, with a CI-enforced no-fabrication test suite.
cli typescript osint security cybersecurity threat-intelligence cisa-kev cve provenance data-integrity vulnerability-intelligence nodejs open-source-intelligence security-tools gdelt
JavaScript TypeScript
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-4346 vulnerability anywhere in the article.
-
TheCyberThrone
CISA Expands KEV Catalog Again adds Zeroday Vulnerabilities
The pace of additions to the Cybersecurity and Infrastructure Security Agency (CISA) Known Exploited Vulnerabilities (KEV) Catalog continues to accelerate. Between July 14 and July 15, 2026, CISA adde ... Read more
-
The Hacker News
ThreatsDay: Game Cheat Spyware, 24-Hour Ransomware, Chrome Sync Stalking + 12 More Stories
A lot of this week’s trouble starts with something that looks close enough.A familiar repo. A useful installer. A harmless sync setting. Then the handoff goes bad, the box starts talking to someone el ... Read more
The following table lists the changes that have been made to the
CVE-2023-4346 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 16, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2023-4346', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-15T17:34:25.185393Z'} {'id': 'CVE-2023-4346', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-15T00:00:00+00:00'} -
Modified Analysis by [email protected]
Jul. 15, 2026
Action Type Old Value New Value Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346 Types: US Government Resource -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Jul. 15, 2026
Action Type Old Value New Value Added Date Added 2026-07-15 Added Due Date 2026-07-15 Added Required Action 2026-07-15 Added Vulnerability Name 2026-07-15 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 15, 2026
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346 Changed SSVC {'id': 'CVE-2023-4346', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2024-10-01T20:32:19.712035Z'} {'id': 'CVE-2023-4346', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-15T17:34:25.185393Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2023-4346', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2024-10-01T20:32:19.712035Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'KNX Association', 'product': 'KNX Protocol Connection Authorization Option 1', 'versions': [{'status': 'affected', 'version': '0'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Sep. 11, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01 No Types Assigned https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01 Third Party Advisory, US Government Resource Added CPE Configuration OR *cpe:2.3:a:knx:connection_authorization:-:*:*:*:*:*:*:*