{
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        "metrics": [
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              "content": {
                "id": "CVE-2026-16347",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-07-29T13:57:29.902200Z",
                "version": "2.0.3"
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          "dateUpdated": "2026-07-29T13:57:56.713Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "RouterOS",
          "vendor": "MikroTik",
          "versions": [
            {
              "status": "affected",
              "version": "All versions"
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          "defaultStatus": "affected",
          "product": "Cloud Hosted Router",
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          ]
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      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Andre Santos of Uni\u00e3o Geek reported this vulnerability to CISA."
        }
      ],
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          "lang": "en",
          "supportingMedia": [
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              "type": "text/html",
              "value": "MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful rate-limiting, account lockout, or source-based restrictions, allowing repeated authentication failures to proceed without defensive response. In some versions, a fixed per-connection delay is present, but it can be bypassed through concurrent sessions, resulting in continued high-volume attempts. This deficiency increases the risk that an attacker could eventually obtain valid credentials and gain unauthorized access to administrative services.\u0026nbsp;\u003cbr\u003e"
            }
          ],
          "value": "MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful rate-limiting, account lockout, or source-based restrictions, allowing repeated authentication failures to proceed without defensive response. In some versions, a fixed per-connection delay is present, but it can be bypassed through concurrent sessions, resulting in continued high-volume attempts. This deficiency increases the risk that an attacker could eventually obtain valid credentials and gain unauthorized access to administrative services."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "GENERAL"
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          "cvssV4_0": {
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "ADJACENT",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "descriptions": [
            {
              "cweId": "CWE-307",
              "description": "CWE-307 Improper restriction of excessive authentication attempts",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-28T19:59:29.927Z",
        "orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
        "shortName": "icscert"
      },
      "references": [
        {
          "tags": [
            "government-resource"
          ],
          "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-209-05"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Improper restriction of excessive authentication attempts in MikroTik RouterOS and Cloud Hosted Router",
      "workarounds": [
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              "value": "No fix is currently available from MikroTik. Until a fix is available, MikroTik recommends that users adopt the following mitigations: Use a strong VPN or other additional protection layer if the API is exposed to public networks.\n\u003cbr\u003e* Configure the unsuccessful-attempt time range (0.1 to 0.5 seconds) in /ip service for all services, including the API, once available.\n\u003cbr\u003e* Connect initially from a trusted network (LAN) port only, then configure the router per your security requirements.\n\u003cbr\u003e* Restrict/limit access to management services from untrusted networks.\n\u003cbr\u003e* Apply firewall rules to control and restrict access to management services where possible.\n\u003cbr\u003e* Use long, randomly generated passwords rather than weak or default-simple ones, to keep the brute-force search space impractically large.\n\u003cbr\u003e* Keep the default randomly generated device password, or replace it with an equally strong one, since minimum complexity isn\u0027t enforced by default.\n\u003cbr\u003e\n\u003cbr\u003eUsers are encouraged to reach out to MikroTik (https://mikrotik.com/support) for further support.\u0026nbsp;"
            }
          ],
          "value": "No fix is currently available from MikroTik. Until a fix is available, MikroTik recommends that users adopt the following mitigations: Use a strong VPN or other additional protection layer if the API is exposed to public networks.\n\n* Configure the unsuccessful-attempt time range (0.1 to 0.5 seconds) in /ip service for all services, including the API, once available.\n\n* Connect initially from a trusted network (LAN) port only, then configure the router per your security requirements.\n\n* Restrict/limit access to management services from untrusted networks.\n\n* Apply firewall rules to control and restrict access to management services where possible.\n\n* Use long, randomly generated passwords rather than weak or default-simple ones, to keep the brute-force search space impractically large.\n\n* Keep the default randomly generated device password, or replace it with an equally strong one, since minimum complexity isn\u0027t enforced by default.\n\n\n\nUsers are encouraged to reach out to MikroTik (https://mikrotik.com/support) for further support."
        }
      ],
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    "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
    "assignerShortName": "icscert",
    "cveId": "CVE-2026-16347",
    "datePublished": "2026-07-28T19:59:29.927Z",
    "dateReserved": "2026-07-20T20:41:22.596Z",
    "dateUpdated": "2026-07-29T13:57:56.713Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}