CVE-2026-67279

Description

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)

Overview

State: PUBLISHED
Assigner (CNA): CERT-PL
CVSS severity: MEDIUM
CVSS score: 6.9 / 10
CVSS vector: 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
Effective score: 6.9 / 10 MEDIUM source: CNA overview
CWE(s): CWE-841
Reserved: 2026-07-29
Published: 2026-09-05 20:00 UTC
Last updated: 2026-09-05 20:40 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/67xxx/CVE-2026-67279.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-05 20:17:18 UTC
NVD last modified: 2026-09-05 21:16:50 UTC

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-72027
Assigner: CERT-PL
Published: Sep 5, 2026, 8:00:57 PM
Updated: Sep 5, 2026, 8:40:29 PM
EUVD base score (CVSS 4.0): 6.9 / 10
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
EUVD-reported EPSS: 0.0000
Vendors: MikroTik
Products: RouterOS (7.24 <7.24.2)

RouterOS (6.0.0 <6.49.21)

RouterOS (7.0.0 <7.23.4)
Aliases: GHSA-pqp3-gjgf-83cf

ENISA description: 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)

EUVD references (7)

Affected products (1)

Vendor	Product	Versions	Platforms
Mikrotik	RouterOS	`7.24` (affected), `7.0.0` (affected), `6.0.0` (affected)	—

Vendor references (7)

References embedded in the original CVE record by the assigning CNA.

https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve third-party-advisory
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ technical-description
https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ exploit
https://mikrotik.com/supportsec/september-2026-vulnerability/ vendor-advisory
https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802 release-notes
https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 release-notes
https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800 release-notes

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (7)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

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/ cvd@cert.pl

Remediations (10)

Microsoft and Adobe Patch Tuesday, August 2026 Security Update Review ...

web:blog.qualys.com

The August 2026 Microsoft Patch Tuesday release delivers security fixes for vulnerabilities affecting a wide range of Microsoft products and services. As attackers continue to exploit unpatched vulnerabilities, timely patching remains critical for reducing exposure and strengthening enterprise security.

2026-09-06 10:33 UTC
Security Advisories and Bulletins | Microsoft Learn

web:learn.microsoft.com

In this library you will find the following security documents that have been released by the Microsoft Security Response Center (MSRC). The MSRC investigates all reports of security vulnerabilities affecting Microsoft products and services, and releases these documents as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-06 10:33 UTC
Security Update Guide - Microsoft Security Response Center

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-09-06 10:33 UTC
CVE-2026-67279 - vulnerability database | Vulners.com

web:vulners.com

Vulners Cve CVE-2026-67279 CVE-2026-67279 🗓️ 05 Sep 2026 20:00:57Reported by CERT-PLType cve 🔗 web.nvd.nist.gov👁 11 Views Unauthenticated SSH rekey bypass in MikroTik RouterOS allows file creation and overwrite.

2026-09-06 10:33 UTC
July 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft has released security updates for 622 vulnerabilities in its July 2026 Patch Tuesday rollout.

2026-09-06 10:33 UTC
DSA-2026-309: Security Update for Dell Command | Update for Multiple ...

web:www.dell.com

Dell Command | Update remediation is available for multiple security vulnerabilities that could be exploited by malicious users to compromise affected systems.

2026-09-06 10:33 UTC
National Vulnerability Database | NIST

web:www.nist.gov

NIST maintains the National Vulnerability Database (NVD), a repository of information on software and hardware flaws that can compromise computer security. This is a key piece of the nation's cybersecurity infrastructure.

2026-09-06 10:33 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-06 10:33 UTC
July 2026 Patch Tuesday: Largest Patch Tuesday 569 CVEs - Tenable

web:www.tenable.com

Microsoft patched 569 CVEs in July 2026 , the largest Patch Tuesday release in its history. 56 critical CVEs patched including three zero-day vulnerabilities.

2026-09-06 10:33 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's September 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-09-06 10:33 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-67279.json.

{
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      "affected": [
        {
          "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"
            },
            {
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                  "vulnerable": true
                }
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              "operator": "OR"
            }
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        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "S\u0142awomir Rozbicki (CERT.PL)"
        }
      ],
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              "type": "text/html",
              "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.<div>This issue was fixed in versions:&nbsp;6.49.21 (Long-term),&nbsp;7.23.4 (Long-term)&nbsp;and&nbsp;7.24.2 (Stable)</div>"
            }
          ],
          "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:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)"
        }
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      "metrics": [
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            "Recovery": "NOT_DEFINED",
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            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
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            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "description": "CWE-841 Improper enforcement of behavioral workflow",
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        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
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        },
        {
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          "url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"
        },
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          "tags": [
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        },
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          "url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
        },
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        },
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          ],
          "url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
        }
      ],
      "source": {
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      },
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      }
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    "datePublished": "2026-09-05T20:00:57.894Z",
    "dateReserved": "2026-07-29T11:59:30.538Z",
    "dateUpdated": "2026-09-05T20:40:29.029Z",
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