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CVE-2023-4346 is an overly restrictive account lockout mechanism vulnerability in implementations of KNX Connection Authorization that support Option 1. Affected devices use a BCU key to establish a device password, but the key often cannot be reset without knowledge of the current password. An attacker able to access the KNX installation over its connected network, or able to physically access a device, can purge devices that lack additional security options and set a BCU key. This can permanently lock legitimate owners out of affected devices.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A KNX protocol vulnerability listed among vulnerabilities actively exploited or operationally weaponized in July 2026.
An overly restrictive account lockout / improper account lockout mechanism vulnerability in KNX devices using KNX Connection Authorization Option 1 that can let an attacker with network or physical access lock the device and cause availability loss.
A vulnerability affecting KNX building automation devices using Connection Authorization Option 1, allowing an attacker with network or physical access to purge devices, set their own BCU key, and lock owners out of the hardware.
An authorization bypass vulnerability in KNX Secure affecting smart building and building automation environments.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.