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VULNERABILITIES

CVE-2026-67279 Details

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)

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain CISA-ADPThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67279 CISA-ADPUS Government Resource
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve [email protected]Third Party Advisory
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ [email protected]MitigationThird Party Advisory
https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802 [email protected]Release Notes

see all 9 references

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability NameDate AddedDue DateRequired Action
Mikrotik RouterOS Improper Enforcement of Behavioral Workflow VulnerabilitySep 25, 2026Sep 28, 2026Apply 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.

Weakness Enumeration

CWE-IDCWE NameSource
CWE-841Improper Enforcement of Behavioral Workflow[email protected]

Affected Products

ProductVersions
mikrotik routeros
>= 6.0, < 6.49.21
>= 7.0, < 7.23.4
>= 7.24, < 7.24.2

CPE

  • cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

8 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-67279
NVD Published Date:
Sep 5, 2026
NVD Last Modified:
Sep 26, 2026
Source:
[email protected]
CVE-2026-67279 Details - Not Deferred