Vulnerability-Lookup

CVE-2026-67277 (GCVE-0-2026-67277)

Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-05 20:39

ENISA

Title

Kernel memory disclosure and denial of service in MikroTik RouterOS btest service

Summary

RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With "random-data=false", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel. This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

Severity

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

CWE

CWE-306 - Missing authentication for critical function

Assigner

CERT-PL ENISA root

References

7 references

URL	Tags
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve	third-party-advisory
https://cert.pl/en/posts/2026/09/vulnerabilities-…	technical-description
https://npratley.net/reversing-mikrotiks-silent-p…	exploit
https://mikrotik.com/supportsec/september-2026-vu…	vendor-advisory
https://forum.mikrotik.com/t/6-49-21-long-term-is…	release-notes
https://forum.mikrotik.com/t/7-23-4-long-term-is-…	release-notes
https://forum.mikrotik.com/t/7-24-2-stable-is-rel…	release-notes

Impacted products

1 product

Vendor	Product	Version	CPE status
Mikrotik	RouterOS	Affected: 7.24 , < 7.24.2 (custom) Affected: 7.0.0 , < 7.23.4 (custom) Affected: 6.0.0 , < 6.49.21 (custom) cpe:2.3:a:mikrotik:routeros::::::::

Credits

Sławomir Rozbicki (CERT.PL)

ENISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 1d9ea784-c941-41ec-aa5f-c1cb172bcb68

Vulnerability ID: CVE-2026-67277

Status: Confirmed

Status Updated: 2026-09-05 00:00 UTC

Exploited: Yes

Timestamps

First Seen: 2026-09-05

Asserted: 2026-09-05

Scope

Notes: MikroTrick | Affected: MikroTik / RouterOS | Description: RouterOS accepts a 'related' btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With 'random-data=false', the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel. This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable) | Patched since: 2026/09/03 | Exploitation type: unknown | CWEs: CWE-306 | Origin source: CERT.PL | Notes: https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/

Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details

Cwes	CWE-306
Euvd	EUVD-2026-72025
Notes	https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
Catalog	ENISA / EU CSIRTs Network (CNW) KEV JSON
Product	RouterOS
Datereported	2026/09/05
Originsource	CERT.PL
Patchedsince	2026/09/03
Vendorproject	MikroTik
Exploitationtype	unknown
Vulnerabilityname	MikroTrick
Threatactorsexploiting

References

Created: 2026-09-05 22:00 UTC | Updated: 2026-09-05 22:00 UTC

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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          "product": "RouterOS",
          "vendor": "Mikrotik",
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          "url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
        },
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          ],
          "url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "Kernel memory disclosure and denial of service in MikroTik RouterOS btest service",
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      }
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    "cveId": "CVE-2026-67277",
    "datePublished": "2026-09-05T20:00:56.614Z",
    "dateReserved": "2026-07-29T11:59:30.538Z",
    "dateUpdated": "2026-09-05T20:39:44.166Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-67277\",\"sourceIdentifier\":\"cvd@cert.pl\",\"published\":\"2026-09-05T20:17:18.120\",\"lastModified\":\"2026-09-05T21:16:50.393\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"RouterOS accepts a \\\"related\\\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \\\"random-data=false\\\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\\n\\n\\n\\nThis issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)\"}],\"affected\":[{\"source\":\"cvd@cert.pl\",\"affectedData\":[{\"vendor\":\"Mikrotik\",\"product\":\"RouterOS\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"7.24\",\"lessThan\":\"7.24.2\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"7.0.0\",\"lessThan\":\"7.23.4\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"6.0.0\",\"lessThan\":\"6.49.21\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"LOW\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-306\"}]}],\"references\":[{\"url\":\"https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://mikrotik.com/supportsec/september-2026-vulnerability/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/\",\"source\":\"cvd@cert.pl\"}]}}"
  }
}

FKIE_CVE-2026-67277

Vulnerability from fkie_nvd - Published: 2026-09-05 20:17 - Updated: 2026-09-05 21:16

ENISA

Severity

8.8 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	cvd@cert.pl	https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
	cvd@cert.pl	https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
	cvd@cert.pl	https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802
	cvd@cert.pl	https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
	cvd@cert.pl	https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800
	cvd@cert.pl	https://mikrotik.com/supportsec/september-2026-vulnerability/
	cvd@cert.pl	https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "RouterOS",
          "vendor": "Mikrotik",
          "versions": [
            {
              "lessThan": "7.24.2",
              "status": "affected",
              "version": "7.24",
              "versionType": "custom"
            },
            {
              "lessThan": "7.23.4",
              "status": "affected",
              "version": "7.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "6.49.21",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "cvd@cert.pl"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "RouterOS accepts a \"related\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\n\n\n\nThis issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)"
    }
  ],
  "id": "CVE-2026-67277",
  "lastModified": "2026-09-05T21:16:50.393",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
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          "vulnIntegrityImpact": "NONE",
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        },
        "source": "cvd@cert.pl",
        "type": "Secondary"
      }
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  "published": "2026-09-05T20:17:18.120",
  "references": [
    {
      "source": "cvd@cert.pl",
      "url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
    },
    {
      "source": "cvd@cert.pl",
      "url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"
    },
    {
      "source": "cvd@cert.pl",
      "url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
    },
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      "source": "cvd@cert.pl",
      "url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
    },
    {
      "source": "cvd@cert.pl",
      "url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
    },
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      "source": "cvd@cert.pl",
      "url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"
    },
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      "source": "cvd@cert.pl",
      "url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"
    }
  ],
  "sourceIdentifier": "cvd@cert.pl",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ],
      "source": "cvd@cert.pl",
      "type": "Secondary"
    }
  ]
}

GHSA-6Q2X-6FHJ-R3W8

Vulnerability from github – Published: 2026-09-05 21:31 – Updated: 2026-09-05 21:31

Details

This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

Severity

8.8 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-67277"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-05T20:17:18Z",
    "severity": "HIGH"
  },
  "details": "RouterOS accepts a \"related\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\n\n\n\nThis issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)",
  "id": "GHSA-6q2x-6fhj-r3w8",
  "modified": "2026-09-05T21:31:20Z",
  "published": "2026-09-05T21:31:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67277"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited"
    },
    {
      "type": "WEB",
      "url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
    },
    {
      "type": "WEB",
      "url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
    },
    {
      "type": "WEB",
      "url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
    },
    {
      "type": "WEB",
      "url": "https://mikrotik.com/supportsec/september-2026-vulnerability"
    },
    {
      "type": "WEB",
      "url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-67277 (GCVE-0-2026-67277)

ENISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Csirt Report Successful Exploitation Confidence: 75% Source: enisa-cnw-kev

Details

References

FKIE_CVE-2026-67277

GHSA-6Q2X-6FHJ-R3W8

Tags

Sightings

Nomenclature