Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay_CVE-2026-34021

{
    "lastseen": "",
    "description": "The Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320, uses RS-485 communication between the server and the microcontroller without cryptographic protection. An attacker with access to the communication path between the server and the microcontroller can sniff RS-485 messages and replay previously observed messages. This can be used, for example, to spoof a \"quit alarm\" message and continuously deactivate the safe alarm.",
    "published": "2026-06-15T10:02:09.049Z",
    "modified": "2026-06-15T10:02:09.049Z",
    "type": "cve",
    "title": "Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay",
    "source": "SEC-VLab",
    "references": "https://wertheim-safes.com/safe-deposit-boxes/\nhttps://r.sec-consult.com/wertdev",
    "id": "CVE-2026-34021",
    "bulletinFamily": "",
    "cwe": [
        "CWE-294"
    ],
    "cvelist": null,
    "sourceData": "Wertheim GmbH Wertheim SafeController 5400 Hardware for VAULT ROOMS (Safe Deposit Locker System - Microcontroller) Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320",
    "sourceHref": "",
    "cvss": {
        "score": 8.6,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Wertheim SafeController 5400 Hardware for VAULT ROOMS (Safe Deposit Locker System - Microcontroller)",
    "version": "Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320",
    "vendor": "Wertheim GmbH",
    "ai_description": "Lack of cryptographic protection in RS-485 communication enables message sniffing and replay",
    "ai_severity": "High",
    "ai_vendor": "Wertheim GmbH",
    "ai_product": "SafeController 5400",
    "ai_version": "6.11.8130.22320",
    "ai_score": 8.6
}