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CVE-2026-67279

Status: AnalyzedMedium (6.9)⚠ Active exploitation

RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

CISA KEV — actively exploited

Affected technologies (1)

Mikrotik — Routeros

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-67279",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-67279",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-25T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 3.9
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "cvd@cert.pl",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6.9,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/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",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "cvd@cert.pl",
      "affectedData": [
        {
          "vendor": "Mikrotik",
          "product": "RouterOS",
          "versions": [
            {
              "status": "affected",
              "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"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-09-05T20:17:18.390",
  "references": [
    {
      "url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cvd@cert.pl"
    },
    {
      "url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "source": "cvd@cert.pl"
    },
    {
      "url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802",
      "tags": [
        "Release Notes"
      ],
      "source": "cvd@cert.pl"
    },
    {
      "url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801",
      "tags": [
        "Release Notes"
      ],
      "source": "cvd@cert.pl"
    },
    {
      "url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800",
      "tags": [
        "Release Notes"
      ],
      "source": "cvd@cert.pl"
    },
    {
      "url": "https://mikrotik.com/supportsec/september-2026-vulnerability/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cvd@cert.pl"
    },
    {
      "url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "cvd@cert.pl"
    },
    {
      "url": "https://bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67279",
      "tags": [
        "US Government Resource"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cvd@cert.pl",
      "description": [
        {
          "lang": "en",
          "value": "CWE-841"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)"
    }
  ],
  "lastModified": "2026-09-26T04:17:47.273",
  "cisaActionDue": "2026-09-28",
  "cisaExploitAdd": "2026-09-25",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CFC981EC-B44C-40B5-945B-2283FADEC961",
              "versionEndExcluding": "6.49.21",
              "versionStartIncluding": "6.0"
            },
            {
              "criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "881306AB-32B1-4B5F-96D8-9532D25F7AE4",
              "versionEndExcluding": "7.23.4",
              "versionStartIncluding": "7.0"
            },
            {
              "criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A41D6B3C-D321-4C61-B3D5-00F8276CB4AC",
              "versionEndExcluding": "7.24.2",
              "versionStartIncluding": "7.24"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cvd@cert.pl",
  "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "cisaVulnerabilityName": "Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability"
}