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CVE-2026-67279

MEDIUM6.5
CISA KEV

Published 2026-09-05 · Updated 2026-09-26 · Source cvd@cert.pl

Summary

CVE-2026-67279 is a medium-severity (CVSS 6.5) vulnerability in MikroTik RouterOS. CISA added it to the Known Exploited Vulnerabilities catalog on September 25, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by September 28, 2026. CISA does not currently list it as used in ransomware campaigns. MikroTik has 5 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 5 known-exploited MikroTik vulnerabilities →

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)

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CWE-841

CISA Known-Exploited Vulnerability

Product: MikroTik — RouterOS

Name: Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability

Date added: 2026-09-25 · Due: 2026-09-28

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.

References

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