CVE-2026-67279

Published Sep 5, 2026

Last updated a month ago

Exploit known CVSS medium 6.9

SSH

SAP

Cloud

Tunneling protocol

RouterOS

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-67279 describes a vulnerability in MikroTik RouterOS SSH where the system improperly handles a client-requested rekey operation. This flaw allows the SSH server to proceed to the connection protocol stage and accept session channel requests, even though user authentication has not been completed. As a result, an unauthenticated client can open an SSH session channel and issue `exec` requests. This capability permits the creation, overwriting, and reconstruction of files within the RouterOS managed file namespace, including critical configuration and diagnostic data.

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)
Source: cvd@cert.pl
NVD status: Analyzed
Products: routeros

Risk scores

CVSS 4.0

Type: Secondary
Base score: 6.9
Impact score: -
Exploitability score: -
Vector string: 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
Severity: MEDIUM

CVSS 3.1

Type: Primary
Base score: 6.5
Impact score: 2.5
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Severity: MEDIUM

Known exploits

Data from CISA

Vulnerability name: Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability
Exploit added on: Sep 25, 2026
Exploit action due: Sep 28, 2026
Required action: 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.

Weaknesses

cvd@cert.pl: CWE-841

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "CFC981EC-B44C-40B5-945B-2283FADEC961",
            "versionEndExcluding": "6.49.21",
            "versionStartIncluding": "6.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "881306AB-32B1-4B5F-96D8-9532D25F7AE4",
            "versionEndExcluding": "7.23.4",
            "versionStartIncluding": "7.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "A41D6B3C-D321-4C61-B3D5-00F8276CB4AC",
            "versionEndExcluding": "7.24.2",
            "versionStartIncluding": "7.24",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.