{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Linksys MX9600/MX4200 -",
          "vendor": "Linksys",
          "versions": [
            {
              "status": "affected",
              "version": "unknown"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Christian Z\u00e4ske via Fulldisclosure"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Advisory ID:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0SYSS-2025-010\nProduct:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0MR9600, MX4200 (and potentially others)\nManufacturer:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Linksys\n\nTested Version(s):\u00a0 \u00a0 \u00a0 \u00a0 \u00a01.0.4.205530 for MR9600, 1.0.13.210200 for MX4200\nVulnerability Type:\u00a0 \u00a0 \u00a0 \u00a0 OS Command Injection (CWE-78)\nRisk Level:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 High\nSolution Status:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Open\nManufacturer Notification: 2025-03-18\nSolution Date:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0-\nPublic Disclosure:\u00a0 \u00a0 \u00a0 \u00a0 \u00a02026-02-12\nCVE Reference:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Not yet assigned\nAuthor of Advisory:\u00a0 \u00a0 \u00a0 \u00a0 Christian Z\u00e4ske, SySS GmbH\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nOverview:\n\nLinksys MX4200 is a Wi-Fi mesh router targeting home users.\n\nThe manufacturer describes the product as follows (see [1]):\n\n\"This router supports the latest Wi-Fi\u00ae 6 (802.11ax) standard for\nnext-level streaming and gaming. Its powerful WiFi 6 mesh coverage\noffers faster WiFi performance for lag-free online gaming and\nsimultaneous streaming to every device and corner of your home.\"\n\nDue to missing neutralization of special elements, OS commands can\nbe injected via the handshake of a TLS-SRP connection, which are\nultimately run as the root user.\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nVulnerability Details:\n\nThe Linksys MR9600 (and other models) provides a service (sct_server\nbinary) running on TCP port 6060 (all interfaces except WAN), which is\nused to integrate other mesh devices into the network. The service\naccepts TLS-SRP connections with a username and password.\n\nThe service uses a different script (smcdb_auth) to receive credential\ninformation using the given username. Since the service does not\nneutralize special elements and appends the username as a command\nline argument, arbitrary OS commands can be injected via the username\nof the TLS-SRP handshake. These commands are run as the root user\nwithout the need of a valid username or password.\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nProof of Concept (PoC):\n\nUsing the \"tlslite-ng\" library, the following Python code will result\nin the LED indicator at the top turning yellow, indicating that the OS\ncommand was successfully executed. No valid username or password is\nneeded.\n\n\u00a0 from socket import *\n\u00a0 from tlslite.api import *\n\n\u00a0 sock = socket.socket(AF_INET, SOCK_STREAM)\n\u00a0 sock.connect((\"192.168.1.1\", 6060))\n\n\u00a0 conn = TLSConnection(sock)\n\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nSolution:\n\nThere is no known solution yet.\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nDisclosure Timeline:\n\n2024-11-11: Vulnerability discovered\n2025-03-18: Vulnerability reported to manufacturer\n2025-04-07: First response from manufacturer\n2025-04-14: Requested an update from manufacturer\n2025-05-06: Acknowledgment of vulnerabilities by the manufacturer\n2026-02-12: Public disclosure\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nReferences:\n\n[1] Product website for Linksys MX4200\n\u00a0 \u00a0 https://support.linksys.com/kb/article/952-en/\n[2] SySS Security Advisory SYSS-2025-010\nhttps://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-010.txt\n[3] SySS Responsible Disclosure Policy\n\u00a0 \u00a0 https://www.syss.de/en/responsible-disclosure-policy\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nCredits:\n\nThis security vulnerability was found by Christian Z\u00e4ske of SySS\nGmbH.\n\nE-Mail: christian.zaeske () syss de\n\nKey ID: 0x7B00D164A32F9AC9\nKey Fingerprint: 51D4 6E9B 3C29 7347 AC01 0F5A 7B00 D164 A32F 9AC9\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nDisclaimer:\n\nThe information provided in this security advisory is provided \"as is\"\nand without warranty of any kind. Details of this security advisory may\nbe updated in order to provide as accurate information as possible. The\nlatest version of this security advisory is available on the SySS website.\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nCopyright:\n\nCreative Commons - Attribution (by) - Version 3.0\nURL: https://creativecommons.org/licenses/by/3.0/deed.en\n\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives \u0026 RSS: https://seclists.org/fulldisclosure/"
        }
      ],
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        },
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          "url": "https://nmap.org/mailman/listinfo/fulldisclosure"
        },
        {
          "url": "https://seclists.org/fulldisclosure/"
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          "url": "https://support.linksys.com/kb/article/952-en/"
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          "url": "https://www.syss.de/en/responsible-disclosure-policy"
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          "url": "https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-010.txt"
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      "source": {
        "defect": [
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        "discovery": "EXTERNAL"
      },
      "title": "[SYSS-2025-010] Linksys MX9600/MX4200 - OS Command Injection",
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          "relationships": [],
          "vulnId": "GCVE-1988-2026-0202",
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