Page generated: 11 Nov 2026, 11:13 UTC
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CVE-2023-4346

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 d…

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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.
CVSS 7.5 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.1/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 7.5: +1.12
  • Fresh EPSS: 1.36%: +0.01

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 6 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Recorded Future
Press · 07 Aug 2026, 07:00 · July 2026 CVE Landscape - Recorded Future
JM Madeira
Press · 06 Aug 2026, 07:00 · Securing Smart Buildings: Why BMS Platforms Cannot Own OT and IoT Security Alone - JM Madeira
Inside Lighting
Press · 22 Jul 2026, 07:00 · U.S. Issues Cybersecurity Warning for Building Automation Protocol - Inside Lighting
Tech Times
Press · 19 Jul 2026, 07:00 · Active Attacks on KNX Smart Building Protocol Leave Hardware Permanently Bricked - Tech Times
The Hacker News
Press · 16 Jul 2026, 07:00 · ThreatsDay: Game Cheat Spyware, 24-Hour Ransomware, Chrome Sync Stalking + 12 More Stories - The Hacker News
See all 6 source documents
Industrial Cyber
Press · 25 Aug 2023, 07:00 · CISA publishes ICS advisories covering hardware vulnerabilities in KNX, Opto 22, Rockwell Automation, CODESYS equipment - Industrial Cyber

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.1 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 7.5; EPSS 1.4%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:59.307003+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
25 Aug 2023, 07:00
Published
29 Aug 2023, 19:38
Added to the CISA KEV catalog
15 Jul 2026, 00:00
Latest press mention
07 Aug 2026, 07:00
Score calculated
05 Nov 2026, 13:58