{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2023-4346",
  "revision": 1,
  "title": "KNX Connection Authorization — device lockout with no reset path",
  "summary": "Building-automation devices using the KNX protocol (KNX) with Connection Authorization Option 1 can be locked by anyone who reaches the bus: an attacker sets the device key and, without the old key, owners often cannot reset the device.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 7.5,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "version": "3.1"
  },
  "epss": 0.01294,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": false,
    "attack_complexity": "low",
    "kev_added": "2026-07-15",
    "prerequisites": "Access to the network the KNX installation sits on, or physical access to a device."
  },
  "kill_chain": "impact",
  "recommended_action": "Separate the KNX installation from untrusted networks, restrict physical access to devices, and turn on the additional device security options; follow CISA ICSA-23-236-01.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2023-4346",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2023-4346",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2023-4346",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-4346",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "writeup",
      "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01"
    }
  ],
  "published_at": "2023-08-29T20:15:10.300Z",
  "issued_at": "2026-09-23T07:33:20.707Z",
  "tags": [
    "knx",
    "building-automation",
    "ics",
    "denial-of-service",
    "kev"
  ]
}